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The document is a test for Cambridge Lower Secondary Mathematics 9, focusing on data collection and bias in various investigations. It includes questions on estimating masses, measuring heights, assessing readability, surveying supermarket customers, and gathering hotel feedback. Students are required to formulate hypotheses, describe data collection methods, and identify potential biases in their approaches.

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53 views3 pages

3ACCF2B0

The document is a test for Cambridge Lower Secondary Mathematics 9, focusing on data collection and bias in various investigations. It includes questions on estimating masses, measuring heights, assessing readability, surveying supermarket customers, and gathering hotel feedback. Students are required to formulate hypotheses, describe data collection methods, and identify potential biases in their approaches.

Uploaded by

maiehabsaad
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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CAMBRIDGE LOWER SECONDARY MATHEMATICS 9: END OF UNIT 6 TEST

Name Date

Stage 9 End of unit 6 test


1 You are investigating the ability of people of your age to estimate masses of everyday objects
such as books, plates or bags of rice. Here are two hypotheses:

• Girls can estimate more accurately than boys.

• Estimates of light objects will be more accurate than estimates of heavy objects.

Describe:

a data you need to collect to test these hypotheses

[2]

b why the data is appropriate

[2]

c how you will collect the data.

[2]

2 You want to collect the heights of a sample of people. Here are three ways to collect the data. For
each method explain why the results could be biased.

a Ask people to tell you their height.

[1]

b Ask people to stand against a wall with a measuring tape on it.

[1]

Cambridge Lower Secondary Mathematics 9 – Byrd, Byrd & Pearce © Cambridge University Press 2021 1
CAMBRIDGE LOWER SECONDARY MATHEMATICS 9: END OF UNIT 6 TEST

c Make your own estimate by looking at each person.

[1]

3 You are investigating the readability of articles in online newspapers. Here are two
ways to do this investigation:

1 Count the number of letters in each word in an article.

2 Measure the length of time it takes to read the article.

For each method:

a Is the method an appropriate way to investigate readability? Give a reason for your answer.

Method 1

Method 2

[2]

b Could the results you get using each method be biased? Give a reason for your answer.

Method 1

Method 2

[2]

Cambridge Lower Secondary Mathematics 9 – Byrd, Byrd & Pearce © Cambridge University Press 2021 2
CAMBRIDGE LOWER SECONDARY MATHEMATICS 9: END OF UNIT 6 TEST

4 You are going to do a survey of a sample of customers in a supermarket. You want to investigate:

• the time a customer is in the supermarket

• the amount of money the customer spends.

a Write down two hypotheses you could investigate.

[2]

b Describe three ways of trying to eliminate bias in your results. Give a reason for each way.

[3]

5 You want to collect feedback from people who have stayed in a hotel. You send the people an email
asking them to complete a short questionnaire online. Give two possible sources of bias.

[2]

[Total: 20 marks]

END OF TEST

Cambridge Lower Secondary Mathematics 9 – Byrd, Byrd & Pearce © Cambridge University Press 2021 3

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