Mathematics

12 April, 10:43

A survey claims that 9 out of 10 doctors (i. e., 90% recommend brand z for their patients who have children. to test this claim against the alternative that the actual propo rtion of doctors who recommend brand z is less than 90%, a random sample of 100 doctors results in 93 who indicate that they recommend brand z. the test statistic in this problem is approximately (round to the nearest hundredth:

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