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The following information is available.
H0 : μ ≥ 220
H1 : μ < 220
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.
a. Is this a one- or two-tailed test? One-tailed testTwo-tailed test
b. What is the decision rule? (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)
(Click to select)
Do not reject
Reject
H0 when z <
c.What is the value of the test statistic? (Negative amount should be indicated by a minus sign. Round your answer to 3 decimal places.)
Value of the test statistic
d.What is your decision regarding H0? RejectDo not reject
e.What is the p-value? (Round your answer to 4 decimal places.)
p-value
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