How do I know which tail a hypothesis test should use?
I can calculate the test statistic, but I keep mixing up left-tailed, right-tailed, and two-tailed tests. Is there a fast way to decide which tail matters?
Read the alternative hypothesis first. The alternative tells you what kind of evidence would contradict the null.
Ha: mu > 4%means right-tailed.Ha: mu < 4%means left-tailed.Ha: mu != 4%means two-tailed.
After that, the rest is mechanical: calculate the statistic, place it on the correct distribution, and compare it with the correct rejection region.
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