The dream times for each of twenty volunteers are measured during two sleep peri

Question

The dream times for each of twenty volunteers are measured during two sleep periods: once after an evening when no alcohol was consumed and once after an evening when alcohol was consumed. It would be appropriate to test the null hypothesis with a

a. two-tailed test at the .05 level of significance

b. one-tailed test, lower tail critical, at the .05 level of significance.

c. one-tailed test, upper tail critical, at the .05 level of significance

d. either a one- or two-tailed test, but at the .001 level of significance.

Explanation / Answer

Here we have given that Twenty volunteers are measured two sleep periods

Once after evening when no alcohol was consumed

And once an evening when alcohol was consumed

So here we can use two tailed test at the 0.05 level of significance.

Ans: a) two-tailed test at the 0.05 level of significance

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