CAIE A-Level Mathematics A2 6.4.2 Sampling Methods Questions
Practise selecting random samples and evaluating sampling methods for bias and suitability.
- Syllabus
- 2028–2030
- Course
- Mathematics 9709
- Level
- A2
Exam points
- use random numbers to select a simple random sample
- identify unsuitable or biased sampling methods
- explain why a sample is representative and appropriate
CAIE A-Level Mathematics A2 6.4.2 Sampling Methods Questions question 1
[Maximum number: 2]
Henri wants to choose a random sample from the 804 students at his college. He numbers the students from 1 to 804 and then uses random numbers generated by his calculator. The first 20 random digits produced by his calculator are as follows.
56710984310966502176
Henri's first two student numbers are 567 and 109.
Use Henri's digits to find the numbers of the next two students in the sample.
There were 30 students in Henri's sample. He asked each of them how much time, X hours, they spent on social media each week, on average. He summarised the results as follows.
n=30Σx=610Σx2=12405
[567, 109], 665, 21
B1 for each.
Marking guidance:
Allow 021.
If more than 2 answers given, count first two and ISW.
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