Question: Now that you have worked with confidence intervals for population means, and you are about to work with hypothesis tests about population means, how to

Now that you have worked with confidence intervals for population means, and you are about to work with hypothesis tests about population means, how to tell whether a t-distribution (t-table) or a standard normal distribution (z-table) is needed (which also implies using either z-interval, t-interval, z-test or t-test).

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