120 trials were conducted worldwide to investigate whether an SMS reminder servi

Question

120 trials were conducted worldwide to investigate whether an SMS reminder service could improve adherence to taking medication despite some unpleasant side effects. Assuming significance tests were conducted at a significance level of 0.05 (so we reject if p<0.05) independently for each trial and that the null hypothesis is actually true, how many of these studies would we expect to incorrectly find a significant result?

a. 4

b. 6

c. 5

d. 120

e. There is insufficient information to estimate the expected number

a. 4

b. 6

c. 5

d. 120

e. There is insufficient information to estimate the expected number

Explanation / Answer

Explanation: There is insufficient information to estimate the expected number, since the probability that these studies would expect incorrectly to find a significant result. The formula for calculating the expected value is np.

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