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ypothesis is true is usually set at 5%. The probability of making a type 2 error
when the alternative hypothesis is true is harder to ?nd. Do you think that prob-
ability depends on the size of the sample? Explain your answer.
10.Refer to Case Study 22.1concerning the ganzfeld procedure for testing ESP. In
earlier studies using the ganzfeld procedurethe results were mixed in terms of
whether they were statistically signi?cant. In other wordssome of the experi-
ments were statistically signi?cant and others were not. Critics used this as evi-
dence that there was really nothing going oneven though more than 5% of the
experiments were successful. Typical sample sizes were from 10 to 100 partici-
pants. Give an explanation for why the results would have been mixed.
11.When the Steering Committee of the Physicians’ Health Study Research Group
(1988) reported the results of the effect of aspirin on heart attackscommittee
members also reported the results of the same aspirin consumptionfor the
same sampleon strokes. There were 80 strokes in the aspirin group and only
70 in the placebo group. The relative risk was 1.15with a 95% con?dence
interval ranging from 0.84 to 1.58.
a.What value for relative risk would indicate that there is no [link widoczny dla zalogowanych]yilai:
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