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22 questions at your level
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Populations & samples
11 questions
Lesson
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A factory makes
40
000
40\,000
40
000
batteries each day.
To check quality, a random sample of
50
50
50
batteries is taken and each one is run until it stops working.
(a)
Write down the population in this investigation.
(b)
Explain why the factory tests a sample of batteries rather than carrying out a census.
(c)
3
3
3
of the
50
50
50
batteries tested lasted less than the advertised time.
Estimate how many of the
40
000
40\,000
40
000
batteries made that day would last less than the advertised time.
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Level 2
4 marks
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Bias & sampling methods
11 questions
Lesson
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Priya wants to find out how much time students at her school spend on homework each week. She asks the 20 students in her own maths class.
(a)
Write down the type of sample Priya has taken.
(b)
Explain why her sample may be biased.
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Level 2
2 marks
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Mark as done
Describe how to choose a random sample of
20
20
20
students from a year group of
200
200
200
.
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Level 2
2 marks
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