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Sampling, Inference & the t-Test · Question 12 of 70

Question 12

MediumOriginal question

In a systematic sample with interval 20, the random start is the 7th unit. Which unit is the 4th to be chosen?

Options for question 12

Show the answer and explanation
CorrectNot quiteAnswer C

Correct answer: C

Explanation

  1. The chosen units are 7, 7+207 + 20, 7+407 + 40, 7+607 + 60, …

  2. The 4th is 7+3×20=677 + 3 \times 20 = 67.

Worth noting

87 adds four intervals; the start itself is the first unit, so only three intervals follow it.

Concept
The units in a systematic sample
Typical time
90 s
Your time
—
The rule this testsPopulation and sample
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Ten questions from Sampling, Inference & the t-Test, at your own pace.

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Ten questions from Sampling, Inference & the t-Test, at your own pace.

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