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A random sample of 49 observations from a normal population yields a sample mean of 85 with a standard deviation of 14. (a) Test the

A random sample of 49 observations from a normal population yields a sample mean of 85 with a standard deviation of 14. (a) Test the claim that the population mean differs from 85. Use a 0.05 significance. (b) Test the claim that the population mean is greater than 85. Use a 0.05 significance level.

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