Chapter 10, Problem 25PT3

To determine

To find: the following specific values for $H_a$ would give the highest power.

Answer to Problem 25PT3

  $\mu =38$

Explanation of Solution

Given:

  $\begin{array}{c}{H}_0:\mu =40\\ H_a:\mu <40\end{array}$

The smaller number of the value of $\mu$ the easier it is reject the null hypothesis, therefore the solution would be the smallest number from the following options

Hence, the correct option is (a)