Professor Gosling wants to examine the effect of caffeine on depression. His res

Question

Professor Gosling wants to examine the effect of caffeine on depression. His research hypothesis is that a moderate dose (25 mg) of caffeine will lower depression scores on a psychological test when compared with no caffeine (placebo). The null hypothesis is that:

a. depression scores with a moderate dose (25 mg) of caffeine = depression scores with no caffeine

b.depression scores with a moderate dose (25 mg) of caffeine > depression scores with no caffeine

c. depression scores with a moderate dose (25 mg) of caffeine >= depression scores with no caffeine

a. depression scores with a moderate dose (25 mg) of caffeine = depression scores with no caffeine

Explanation / Answer

Answer: null hypothesis is basically a term that refer that there is no relationship between two measured phenomena, or we can say that there is no relationship between the groups. So according to it:

a. depression scores with a moderate dose (25 mg) of caffeine = depression scores with no caffeine

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