Use to check the normality of a distribution
Select one:
a. Empirical Rule
b. None of the choices
c. Z score
d. Normal quantile plot
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The correct answer is: Normal quantile plot
Question 2
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Identify if the random variable is a DISCRETE or CONTINUOUS.
Internet speed in an office
Answer:
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The correct answer is: CONTINUOUS
Question 3
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Which of the following describes a Normal Distribution Curve.
Select one:
a. All of the choices
b. Bell shaped
c. Distribution are denser in the center of the curve
d. None of the choices
e. Symmetric
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The correct answer is: All of the choices
Question 4
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The formula for the test statistics is:
Select one:
a. t=sn√−x¯μ0t=sn−x¯μ0
b. t=sn√−μ0x¯t=sn−μ0x¯
c. x¯±n−−√(σzα2)x¯±n(σzα2)
d. x¯±zα2(σn−−√)x¯±zα2(σn)
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Your answer is incorrect.
The correct answer is: x¯±zα2(σn−−√)x¯±zα2(σn)
Question 5
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Identify whether each example describes a random sample. Answer with Yes or No
Shake a bag of colored balls, reach in and select a marble with eyes closed.
Answer:
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The correct answer is: Yes
Question 6
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What is the probability of getting all head when a three coins are tossed?
Answer:
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The correct answer is: 1/8
Question 7
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Identify whether each example describes a random sample. Answer with Yes or No
Select all registered voters in a community whose family income is below 10,000 pesos.
Answer:
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The correct answer is: Yes
Question 8
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Given the following mean, compute for the Mean of Means. The answer must have two decimal places.
4.5, 9.2, 9.1, 8.4
Answer:
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The correct answer is: 2.60
Question 9
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True or False: The bigger the sample size, the more closely the samples will be clustered around the true value.
Answer:
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The correct answer is: TRUE
Question 10
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Appropriate graphical summary of the distribution of a categorical variable
Select one:
a. scatter plot
b. box plot
c. bar graph
d. residual plot
e. stemplot
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Your answer is correct.
The correct answer is: bar graph
Question 11
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Following is a five-number summary of the number of dates, before getting married, of 100 BYU students. Min Q1 Median Q3
Max 10 40 80 100 500 about 25% of the students participated in more than ______________________ dates before getting
married.
Select one:
a. 10
b. 100
c. 500
d. 40
e. 80
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Your answer is correct.
The correct answer is: 100
Question 12
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What is the probability of getting the same numbers on 3 dice when they are thrown simultaneously?
Answer:
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The correct answer is: 1
Question 13
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What is the formula to calculate for the z-score?
Select one:
a. Standard deviation divided by the deviation
b. Deviation less standard deviation divided by the observed value
c. Mean value of variable divided by the difference of standard deviation and deviation
d. Mean value of the variable subtracted from the observed value divided by the standard deviation
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The correct answer is: Mean value of the variable subtracted from the observed value divided by the standard deviation
Question 14
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In a normal distribution curve,
Select one:
a. Mean, median and mode coincide at the center
b. None of the choices.
c. Mean is equal to mode
d. Median is at the right side of the curve and mode is at the left side of the curve
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The correct answer is: Mean, median and mode coincide at the center
Question 15
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In a normal curve, the bigger the values of standard deviation results to a
Select one:
a. wider curve
b. skewed to the left
c. narrower curve
d. straight live curve
e. skewed to the right
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The correct answer is: wider curve
Question 16
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Given the data set 10,11,11,12,12,12,13,13,13,13,24,24,14,15,15,16, how many numbers are in the lower quartile?
Select one:
a. 6
b. 4
c. 0
d. 1
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The correct answer is: 4
Question 17
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The distribution that describes the spread of the means of multiple samples from the sample population
Select one:
a. Mode
b. Deviation Error
c. Parameter
d. Sample Distribution of sample means
e. Population
f. Standard Deviation
g. Sample
h. Distribution Error
i. Mean
j. Population Mean
k. Sample
l. Standard deviation of the distribution of the sample means
m. Statistics
n. Sampling Error
o. Random Sample
p. Median
q. Standard Curve
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The correct answer is: Sample Distribution of sample means
Question 18
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The standard deviation of the normal distribution is
Select one:
a. should always be a positive number
b. always equal to zero
c. greater than or equal to zero
d. always equal to one
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The correct answer is: always equal to one
Question 19
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The weighted average of the possible values of random variables.
Select one:
a. Standard Deviation
b. Mean
c. Variance
d. Mode
e. Median
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The correct answer is: Mean
Question 20
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For a particular set of data, the mean is less than the median. Which of the following statements is most consistent with this
information?
Select one:
a. the distribution of the data is symmetric
b. mean is less than the median - does not give any information about the shape of the distribution
c. the distribution of the data is skewed to the right
d. the distribution of the data is skewed to the left
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Your answer is incorrect.
The correct answer is: the distribution of the data is skewed to the left
Question 21
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An example of a parameter.
Select one:
a. Standard Deviation
b. Standard Curve
c. Statistics
d. Random Sample
e. Sampling Error
f. Deviation Error
g. Population
h. Distribution Error
i. Sample
j. Sample Distribution of sample means
k. Sample
l. Mode
m. Parameter
n. Mean
o. Standard deviation of the distribution of the sample means
p. Population Mean
q. Median
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The correct answer is: Population Mean
Question 22
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Which of the following statement is CORRECT?
Select one:
a. Continuous random variables are finite numbers
b. A discrete variable is a random variable where data can take infinitely many variables
c. A discrete variable are countable number of possible values
d. A continuous random variable assigns a whole number to each possible outcome of an experiment
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The correct answer is: A discrete variable are countable number of possible values
Question 23
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A researcher wants to know the average dating expenses for BYU single students. The researcher obtained a list of single
students from the Records Office who live in the BYU dorms. From this list , 50 students are randomly selected. The 50
students are contacted by phone and the amount they spent on dates are recorded. The average dating expense of the 50
students is $35 with a standard deviation of $8. What is the population of interest?
Select one:
a. the 50 students selected
b. all BYU single students
c. all BYU students
d. the number of single students who spends between 20$ to 50$ on date
e. average dating expenses of students
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Your answer is correct.
The correct answer is: all BYU single students
Question 24
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True or False: Variance Error is the difference between a sample statistic used to estimate a population parameter and the
actual but unknown value of the parameter
Answer:
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The correct answer is: FALSE
Question 25
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True or False: The larger the sample size the closer the sampling distribution was to a normal distribution
Answer:
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The correct answer is: TRUE
Question 26
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The range of probability is
Select one:
a. negative 1 to positive 1
b. can be any number (positive or negative)
c. from zero to 1
d. from zero to any positive number
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The correct answer is: from zero to 1
Question 27
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How many possible outcomes when you simultaneously toss three fair coins.
Select one:
a. 8
b. 6
c. 9
d. 3
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The correct answer is: 8
Question 28
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This determines the degree to which values of a random variable differ from the expected value.
Select one:
a. Mode
b. Standard Deviation
c. Variance
d. Median
e. Mean
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The correct answer is: Variance
Question 29
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Find the median of the following data set.
44, 46, 29, 39, 59, 59, 39
Select one:
a. 44
b. (44 + 46 + 29 + 39 + 59 + 59 + 39)/7
c. (44 + 46 + 29 + 39 + 59 + 59 + 39)/2
d. 39
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The correct answer is: 39
Question 30
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Number of rooms & employees are examples of _________________.
Select one:
a. Sample Space
b. Continuous Random Variables
c. Discrete Random Variables
d. Fixed Variables
e. None of the choices
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The correct answer is: Discrete Random Variables
Question 31
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What is the formula to calculate the standard deviation of the sampling distribution?
Select one:
a. The sample size divided by the square root of the standard deviation
b. Standard deviation of the population divided by the square root of the sample size
c. The square of the standard deviation of the population divided by the sample size
d. Standard deviation of the population divided by the square of the sample size
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The correct answer is: Standard deviation of the population divided by the square root of the sample size
Question 32
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The mean of the normal distribution is
Select one:
a. should always be a positive number
b. always equal to zero
c. greater than or equal to zero
d. always equal to one
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The correct answer is: always equal to zero
Question 33
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It is the difference between a sample statistic used to estimate a population parameter and the actual but unknown value of
the parameter
Select one:
a. Sample
b. Median
c. Statistics
d. Mean
e. Distribution Error
f. Population Mean
g. Standard deviation of the distribution of the sample means
h. Standard Deviation
i. Random Sample
j. Deviation Error
k. Sample Distribution of sample means
l. Population
m. Parameter
n. Sampling Error
o. Mode
p. Standard Curve
q. Sample
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The correct answer is: Sampling Error
Question 34
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True or False: Standard deviation of the distribution of the sample means is computed as the population standard deviation
multiplied by the square root of the sample size.
Answer:
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The correct answer is: FALSE
Question 35
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Given the following sample data, compute for the true mean. The answer should be rounded off to one decimal place.
3 5 5 5 6 6 8 8 13 15 17 30
Answer:
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The correct answer is: 10.8
Question 36
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A representative subset of a population
Select one:
a. Median
b. Standard Deviation
c. Deviation Error
d. Statistics
e. Sample
f. Mean
g. Sample
h. Sampling Error
i. Random Sample
j. Standard deviation of the distribution of the sample means
k. Distribution Error
l. Parameter
m. Population
n. Standard Curve
o. Mode
p. Population Mean
q. Sample Distribution of sample means
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The correct answer is: Sample
Question 37
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After a Church game, Jeremiah scored 40 points. His coach, who is a Statistics teacher, told him that the standardized score
(z-score) for his points on the game, is 2.5. What is the best interpretation of this standardized score?
Select one:
a. Only 2.5% of the players scored higher than Jeremiah.
b. Jeremiah's scoring is 2.5 points above the average scoring in the league.
c. Jeremiah's scoring is 2.5 standard deviations above the average scoring in the league.
d. Jeremiah's score is only 2.5.
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Your answer is correct.
The correct answer is: Jeremiah's scoring is 2.5 standard deviations above the average scoring in the league.
Question 38
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It is also called 68-95-99.7 Rule.
Select one:
a. None of the choices
b. Z score Rule
c. Empirical Rule
d. Variance Rule
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The correct answer is: Empirical Rule
Question 39
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This are numbers that summarizes data for an entire population
Select one:
a. Deviation Error
b. Standard Deviation
c. Standard deviation of the distribution of the sample means
d. Mode
e. Median
f. Sample Distribution of sample means
g. Mean
h. Sampling Error
i. Standard Curve
j. Statistics
k. Parameter
l. Sample
m. Population
n. Population Mean
o. Sample
p. Random Sample
q. Distribution Error
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The correct answer is: Parameter
Question 40
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This are numbers that summarizes data from a sample
Select one:
a. Standard deviation of the distribution of the sample means
b. Sample Distribution of sample means
c. Sample
d. Standard Deviation
e. Mean
f. Sampling Error
g. Distribution Error
h. Standard Curve
i. Random Sample
j. Median
k. Population
l. Sample
m. Population Mean
n. Parameter
o. Deviation Error
p. Mode
q. Statistics
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The correct answer is: Statistics
Question 41
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1. Given the data set below, compute for the variance. (Round off your answer to the nearest hundredths):
x 0 1 2 3 4 5
p(x) 0.1 0.2 0.3 0.4 0.3 0.2
Answer:
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The correct answer is: 5.98
Question 42
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Given the data set 10,11,11,12,12,12,13,13,13,13,24,24,14,15,15,16, find the upper quartile
Select one:
a. 13,13,24,24,14,15,15,16
b. 14
c. 24
d. 16
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The correct answer is: 14
Question 43
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Identify if the random variable is a DISCRETE or CONTINUOUS.
Number of proposed thesis in a university
Answer:
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The correct answer is: DISCRETE
Question 44
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Identify whether each example describes a random sample. Answer with Yes or No
Women who volunteer to take a survey on human rights.
Answer:
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The correct answer is: No
Question 45
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True or False: Sampling Error is the degree of error expected for a given sample design
Answer:
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The correct answer is: TRUE
Question 46
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Identify whether each example describes a random sample. Answer with Yes or No
The manager chooses 30 employees randomly from a department.
Answer:
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The correct answer is: Yes
Question 47
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The standard deviation of Stats221 Final scores for a sample of 200 students was 10 points. An interpretation of this standard
deviation is that the
Select one:
a. the lowest score is 10
b. the finals scores tended to center at 10 points
c. the range of final scores is 10
d. typical distance of the final scores from their mean was about 10 points
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Your answer is correct.
The correct answer is: typical distance of the final scores from their mean was about 10 points
Question 48
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A researcher wanted to estimate the average amount of money spent per semester on books by BYU students. A SRS of 100
BYU students were selected. They visited the addresses during the Summer term and had those students who were at home
fill out a confidential questionnaire. This procedure is
Select one:
a. unreliable because the sample size should be at least 500
b. unbiased because SRS was used to get the addresses
c. likely to be biased because students are less likely to be enrolled during the summer term
d. Unreliable because surveys are never as good as experiments
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Your answer is correct.
The correct answer is: likely to be biased because students are less likely to be enrolled during the summer term
Question 49
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True or False: Random sample happened when data is collected in no certain order
Answer:
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The correct answer is: TRUE
Question 50
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1. Given the data set, find the Mean Value or Expected value (round off your answer to the nearest tenths):
x 0 1 2 3 4 5
p(x) 0.1 0.2 0.3 0.4 0.3 0.2
Answer:
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The correct answer is: 4.2
Question 51
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It is measure of the number of standard deviations a particular data value
Select one:
a. None of the choices
b. Z score
c. Normal quantile plot
d. Empirical Rule
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The correct answer is: Z score
Question 52
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Identify if the random variable is a DISCRETE or CONTINUOUS.
The brightness of an LED bulb
Answer:
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The correct answer is: CONTINUOUS
Question 53
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Identify whether each example describes a random sample. Answer with Yes or No
Selects all areas in the Philippines who are affected by typhoon and with 5th and 6th income class.
Answer:
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The correct answer is: Yes
Question 54
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What does probability sampling allows us to do?
Select one:
a. make inferences about population parameters
b. assess cause and effect relationship
c. remove sampling variability
d. exactly represents the population
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Your answer is incorrect.
The correct answer is: make inferences about population parameters
Question 55
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According to the Empirical Rule, ________ % of the sample estimates will fall within one standard error above the population
parameter.
Select one:
a. 100
b. 50
c. 34
d. 30
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The correct answer is: 34
Question 56
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Given the following sample data, compute for the true mean. The answer must have two decimal places.
1112345558888
Answer:
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The correct answer is: 4.53
Question 57
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Given the following mean, compute for the Mean of Means. The answer should be rounded off to the nearest hundredths.
3.2 3.6 3.9 9.2
Answer:
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The correct answer is: 1.65
Question 58
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Assuming z-score is -1, which of the following statement is TRUE.
Select one:
a. All values are equal to the mean.
b. All values are equal to the z-score
c. All values are less than the mean.
d. All values are greater than the mean.
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The correct answer is: All values are less than the mean.
Question 59
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Identify whether each example describes a random sample. Answer with Yes or No.
Collects the number of students who rides on the train.
Answer:
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The correct answer is: Yes
Question 60
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It is the degree of error expected for a given sample design
Select one:
a. Standard Curve
b. Population Mean
c. Sample
d. Deviation Error
e. Statistics
f. Population
g. Median
h. Mode
i. Sample Distribution of sample means
j. Mean
k. Standard Deviation
l. Random Sample
m. Sample
n. Distribution Error
o. Standard deviation of the distribution of the sample means
p. Sampling Error
q. Parameter
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The correct answer is: Sampling Error
Question 61
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Identify whether each example describes a random sample. Answer with Yes or No.
Each audience in a game show is assigned a number from 111 to 666 and roll three standard dice to choose random
contestants.
Answer:
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The correct answer is: Yes
Question 62
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What is the probability distribution of occurring the all heads in a toss of three coins?
Select one:
a. 0.25
b. 0
c. 1
d. 0.1255
e. None of the choices
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The correct answer is: 0.1255
Question 63
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Two dice is rolled and the sum of face up is being recorded and represented as X. What is P(x <= 5)?
Answer:
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The correct answer is: 10
Question 64
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Which of the following is used to calculate population parameter?
Select one:
a. Empirical Rule Estimation
b. Point Estimate
c. T distribution
d. Central Limit Theorem Estimate
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The correct answer is: Point Estimate
Question 65
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Identify whether each example describes a random sample. Answer with Yes or No.
A teacher conducts examination to all his students.
Answer:
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The correct answer is: No
Question 66
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In a given experiment, the sum of all probabilities is
Select one:
a. Zero
b. One
c. can be any number (positive or negative)
d. All positive numbers
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The correct answer is: One
Question 67
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The formula to computer for the confidence interval is?
Select one:
a. x¯±z∗ (σn−−√)2x¯±z∗ (σn)2
b. x¯±n−−√(σzα2)x¯±n(σzα2)
c. x¯±zα2(σn−−√)x¯±zα2(σn)
d. x¯±σ(zα2n−−√)x¯±σ(zα2n)
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Your answer is correct.
The correct answer is: x¯±zα2(σn−−√)x¯±zα2(σn)
Question 68
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The process of assigning a number to each member of the population
Select one:
a. Sampling Error
b. Population
c. Deviation Error
d. Sample Distribution of sample means
e. Sample
f. Sample
g. Median
h. Standard deviation of the distribution of the sample means
i. Distribution Error
j. Standard Curve
k. Mean
l. Population Mean
m. Random Sample
n. Parameter
o. Mode
p. Statistics
q. Standard Deviation
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The correct answer is: Random Sample
Question 69
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The mean of sample should fall ________________ the lower and upper values of the confidence interval.
Select one:
a. above
b. outside
c. below
d. within
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The correct answer is: within
Question 70
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It is a part of population intended to represent a population as a whole.
Select one:
a. Median
b. Distribution Error
c. Mode
d. Statistics
e. Standard deviation of the distribution of the sample means
f. Population
g. Population Mean
h. Deviation Error
i. Sample Distribution of sample means
j. Sample
k. Sampling Error
l. Standard Curve
m. Random Sample
n. Parameter
o. Standard Deviation
p. Mean
q. Sample (Answer)
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The correct answer is: Sample (Answer)
Question 71
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Identify if the random variable is a DISCRETE or CONTINUOUS.
Speed of a tropical storm in the Philippines
Answer:
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The correct answer is: CONTINUOUS
Question 72
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It is computed as the population standard deviation divided by the square root of the sample size
Select one:
a. Standard Deviation
b. Parameter
c. Standard Curve
d. Statistics
e. Standard deviation of the distribution of the sample means
f. Sample
g. Deviation Error
h. Distribution Error
i. Sample Distribution of sample means
j. Mode
k. Mean
l. Sample
m. Population
n. Random Sample
o. Median
p. Population Mean
q. Sampling Error
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The correct answer is: Standard deviation of the distribution of the sample means
Question 73
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This is states that the percentages of data in a normal distribution within 1,2 and 3 standard deviations.
Select one:
a. Z score
b. None of the choices
c. Empirical Rule
d. Normal quantile plot
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The correct answer is: Empirical Rule
Question 74
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Identify whether each example describes a random sample. Answer with Yes or No.
Collects the election results in all areas in the Philippines during election
Answer:
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The correct answer is: No
Question 75
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In a normal curve, the mean is located at the
Select one:
a. highest point of the curve
b. midpoint of the curve
c. lowest point of the curve
d. intersection of the lowest and highest point
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The correct answer is: highest point of the curve
Question 76
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Which of the following statement is TRUE.
Select one:
a. Countable number of values are called discrete variables
b. Non-countable values are called discrete variables
c. Infinite numbers are considered discrete variables.
d. All of the statements are TRUE.
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The correct answer is: Countable number of values are called discrete variables
Question 77
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Formula to compute for the variance
Select one:
a. σ2=Σ(x−μ)2p(x)σ2=Σ(x−μ)2p(x)
b. σ2=Σ(x−p(x))2μσ2=Σ(x−p(x))2μ
c. σ2=Σ(x−μ)2/p(x)σ2=Σ(x−μ)2/p(x)
d. σ2=Σ(x−p(x))2/μσ2=Σ(x−p(x))2/μ
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Your answer is incorrect.
The correct answer is: σ2=Σ(x−μ)2/p(x)σ2=Σ(x−μ)2/p(x)
Question 78
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Which research method can show a cause and effect relationship between the explanatory and response variables?
Select one:
a. a comparative experiment where each single student is randomly assigned to one or two treatments
b. an observational study based on a carefully selected large SRS of single students
c. a sample survey based on a simple random sample of single students
d. a study using single students where the males are given the treatment and the females were given the placebo
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Your answer is correct.
The correct answer is: a comparative experiment where each single student is randomly assigned to one or two treatments
Question 79
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Identify whether each example describes a random sample. Answer with Yes or No
Renmel closes his eyes, opens a book and randomly points to a word on the page. She repeats the process for 30 times.
Answer:
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The correct answer is: No
Question 80
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Which of the following data sets has the largest standard deviation?
Select one:
a. 888.5, 888. 6, 888. 7, 888. 9
b. 2,3,4,5,6
c. 350, 350, 350, 350, 350, 350
d. 301, 304, 306, 308, 311
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Your answer is correct.
The correct answer is: 301, 304, 306, 308, 311
