Cambridge Lower Secondary Checkpoint Mathematics: Statistics and Probability

Statistics and Probability: Data handling, interpretation, and chance

Question 1 of 30

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Data collection and sampling (bias):

A student wants to estimate the average number of minutes students in Year 8 spend on homework each school day. She stands at the library door at 4:00 p.m. and asks the next 30 students leaving the library, "How many minutes of homework do you do each day?"

Which reason best explains why her method may produce a biased estimate?

Select one option.

Thirty students is too small a sample to calculate any average.
Asking a question always makes people change their answers.
Students leaving the library at 4:00 p.m. may not represent all Year 8 students' homework habits.
The question should be asked only to students who do no homework.
Homework time cannot be measured because minutes are not numbers.

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