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) 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 is less than the critical value for α = 0.10 and α = 0.05, so H0 is rejected at these levels. However, it is not less than the critical value for α = 0.01, so H0 is not rejected at this level.

A Survey Claims That 9 Out of 10 Doctors Recommend