A survey claims that 9 out of 10 doctors recommend aspirin for their patients with headaches.To test this claim against the alternative that the actual proportion of doctors who recommend aspirin is less than 0.90,a random sample of 100 doctors was selected.^{Suppose that the test statistic is - 2.20.Can you conclude that}^H0 ^{should be rejected at}^the (a)α= 0.10, (b)α= 0.05,and (c)α= 0.01 level of Type I error? A)(a)yes; (b)yes; (c)yes B)(a)no; (b)no; (c)no C)(a)no; (b)no; (c)yes D)(a)yes; (b)yes; (c)no

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Quizplus · Accepted Answer

The test statistic of -2.20 corresponds to p-values that would lead to rejection of the null hypothesis at the 0.05 and 0.10 levels (since critical values for these levels are approximately -1.645 and -1.282, respectively), but not at the 0.01 level (since the critical value is approximately -2.33).

A Survey Claims That 9 Out of 10 Doctors Recommend