Perform a Hypothesis Test for the Population Mean $$\begin{array} { l } \mathrm { H } _ { 0 } : \mu = \mu _ { 0 } \\ \mathrm { H } _ { \mathrm { a } } : \mu < \mu _ { 0 } \end{array}$$

Perform a hypothesis test for the population mean. Assume that preliminary data analyses indicate that it is reasonable to apply the z-test. Use the critical-value approach.
-A hypothesis test for a population mean is conducted. The hypotheses are: $$\begin{array} { l } \mathrm { H } _ { 0 } : \mu = \mu _ { 0 } \\ \mathrm { H } _ { \mathrm { a } } : \mu < \mu _ { 0 } \end{array}$$ The significance level is 0.08 and the critical value is -1.41. Sketch a normal curve displaying the decision criterion. This curve will represent the normal curve for the test statistic under the assumption that the null hypothesis is true. On your graph indicate the area in the tail, the critical value, the rejection region, and the nonrejection region.

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