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[Solved] A sample of 64 observations is selected from a normal population. The sample mean is 215, and the sample standard deviation is 15. Conduct the

Question: A sample of 64 observations is selected from a normal population. The sample mean is 215, and the sample standard deviation is 15. Conduct the following test of hypothesis using the .03 significance level.

\[\begin{aligned} & {{H}_{0}}:\mu \ge \text{220} \\ & {{H}_{A}}:\mu <\text{220} \\ \end{aligned}\]

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