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Sampling, Inference & the t-Test · Question 2 of 70

Question 2

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A sample of 30 is to be drawn by systematic sampling from a list of 600 students. What is the sampling interval?

20

Correct answerYour answer

21

Correct answerYour answer

30

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570

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CorrectNot quiteAnswer A

Correct answer: A

The interval is $k = \frac{N}{n}$ , the population size over the sample size.
$k = \frac{600}{30} = 20$ : every 20th student after a random start.

Worth noting

30 is the sample size, not the gap between chosen students.

Concept: The sampling interval
Typical timeTypical: 60 s
Your timeYours: —

The rule this testsPopulation and sample

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