Describe when a z-test should be performed as opposed to a t-test? Which (if any) can we use all the time? Why or why not?

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bus352 week 7 dq 1 & dq 2
dq 1

Describe when a z-test should be performed as opposed to a t-test? Which (if any) can we use all the time? Why or why not?

dq 2

Your manager, who just read an abridged version of a statistics book, wants you to test hypotheses for the difference in two population means. The sample sizes for each are 23. He is adamant that you perform a z-test. What would you tell him? What specific explanation would you give?