A sample of 64 observations is selected from a normal population. The sample mea

Question

A sample of 64 observations is selected from a normal population. The sample mean is 215, and the population standard deviation is 15. Conduct the following test of hypothesis using the .025 significance level.

What is the decision rule? (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)

What is the value of the test statistic? (Negative amount should be indicated by a minus sign. Round your answer to 3 decimal places.)

Explanation / Answer

a.) One sided test

b.) Reject Ho when Z < 1.96

c.) Z = (215 - 220)/(15/64)

= -2.667

d.) Reject Ho

e.) P-value = 0.00387

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