Twelve people who suffer from chronic fatigue syndrome volunteer to take part in

Question

Twelve people who suffer from chronic fatigue syndrome volunteer to take part in an experiment to see if shark fin extract will increase one's energy level. The researchers decide that the control group will comprise four subjects. To choose the four subjects in the control group, the researchers label the subjects 1- 12. Use the list of random digits below and two-digit labels to determine the labels of the four subjects who will end up in the control group. 02902 28461 80624 10082 56872 88033 48932 03845 98302 83623 36704 19223 95034 05756 28713 96409 12531 42544 82853 A. 2, 6, 8, 3 B. 2, 9, 8, 4 C.2, 3, 9, 12 D. 0, 2, 9, 8

Explanation / Answer

We simply read off random digits ignoring those that are out of range or recur (we are sampling without replacement) until we get four of them. We take pairs, ignoring repetitions and those out of range, until we have 4 of them.,,,

Here the pairs are [02], 90, 22, 84, 61, 80, 62 41, 00, 82, 56, 87, 28, 80, 33, 48, 93, 20, 38, 45, 98, 30, 28, 36, 23, 36, 70, 41, 92, 23, 95, [03], 40, 57, 56, 28, 71, 39, 64, [09], [12]

The chosen subjects are in square brackets. They are 2, 3, 9 and 12. Therefore option C is the answer

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