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 we 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)yes; (b)yes; (c)no D)(a)no; (b)no; (c)yes

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Quizplus · Accepted Answer

The test statistic of -2.20 is compared against the critical values for a left-tailed test. At α = 0.10 and α = 0.05, the critical values are -1.28 and -1.645 respectively, so we reject H0. At α = 0.01, the critical value is -2.33, so we do not reject H0.

A Survey Claims That 9 Out of 10 Doctors Recommend