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Iubat-International University of Business Agriculture and Technology

This document contains the instructions and questions for a final exam in statistics. It provides the course code, total marks, duration, and includes instructions to return the question paper and answer script after completion. The exam consists of 5 questions covering key statistical concepts like measures of central tendency, types of variables, hypothesis testing, probability, sampling, and correlation. It requests calculations and interpretations related to finding correlation coefficients, stratified sampling, probability, and hypothesis testing to verify a claim about battery life.

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Md Sakawat Hossain
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116 views2 pages

Iubat-International University of Business Agriculture and Technology

This document contains the instructions and questions for a final exam in statistics. It provides the course code, total marks, duration, and includes instructions to return the question paper and answer script after completion. The exam consists of 5 questions covering key statistical concepts like measures of central tendency, types of variables, hypothesis testing, probability, sampling, and correlation. It requests calculations and interpretations related to finding correlation coefficients, stratified sampling, probability, and hypothesis testing to verify a claim about battery life.

Uploaded by

Md Sakawat Hossain
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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IUBATINTERNATIONAL UNIVERSITY OF BUSINESS AGRICULTURE AND TECHNOLOGY

Final examination

STA 240

Full marks: 100

Time: 3 hours

ID

NAME

MARKS

RETURN THE QUESTION PAPER ALONG WITH THE ANSWER SCRIPT AFTER THE
EXAM

1. Explain the following terms with at least one example in each case :
a) Median & Mode
b) Sample & Population
e) Interval & Ratio Variable
f) Geometric & Harmonic mean
i) Scatter diagram & Line graph
k) Null & Alternative Hypothesis
m) Discrete & Continuous

c)
d)
g)
h)
j)
l)
n)

Variable

Mean & Mean Deviation


Nominal & Ordinal Variable
One tailed & Two tailed Test
Simple & Multiple bar diagram
Variance & Standard Deviation
Qualitative & Quantitative Variable
Dependent & Independent
Variable

2. Find correlation coefficient

( r ) and regression coefficients ( a & b

) for X & Y :
X
Y

0
1

1
2

2
3

Also give interpretation

3
4
/

4
5

5
6

6
7

7
8

8
9

explanation of the results .

3. What do you understand by stratified sampling ?

Explain with an

example .
4. A box contains 3 red, 7 green and 20 white balls. If a ball is drawn
from the box at random, what is the probability that this ball is
neither white nor green ?
5. A company claims that its batteries have a life of at least 100 hours.

You try to verify this for a sample of

n = 100

Md. Mortuza Ahmmed

with

= 97 hours

and

s = 3 hours .

Test at

0.05

1.645 .

Md. Mortuza Ahmmed

where the critical value is

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