Okay, I think I've got it. Since the sample size is 30, which is relatively small, we should use a t-test instead of a z-test. The question is asking us to validate if they met their requirement, so a one-sample t-test is the way to go.
I'm a bit unsure about this one. The options seem pretty similar, so I'll have to really analyze the role descriptions to determine the correct answer.
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