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 H0 220 H1 220 (a) Is this a one or two tailed test (b) What is the decision rule (c) What is the value of the test statistic (d) What is your decision regarding H0 (e) What is the p value Interpret it

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

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.

H0: µ ≤220

H1: µ <220

(a) Is this a one- or two-tailed test?

(b) What is the decision rule?

(d) What is your decision regarding H0?

(e) What is the p-value? Interpret it.

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