A sample of 40 observations is selected from a normal population. The sample mea

Question

A sample of 40 observations is selected from a normal population. The sample mean is 64, and the population standard deviation is 8. Use the 0.01 significance level.

H1: ? ? 65

What is the value of the test statistic? (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)

  Value of the test statistic_________

H1: ? ? 65

What is the value of the test statistic? (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)

  Value of the test statistic_________

Explanation / Answer

Test statistic z = (xbar - mu)/(stdev/sqrt(n))

population stdev = 8; sample mean = 64 and sample size n = 40; mu = 65

Test statistic z = (64 - 65)/(8/sqrt(40)) = -0.79

p value = 0.4295

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