- One-tailed (right-tailed) test.
- One-tailed (left-tailed) test.
- Two-tailed test.
- Non-directional test.
180. A medicinal study is testing a new drug for pain relief. The null hypothesis states that the mean pain reduction is zero (no effect). The alternative hypothesis states that the mean pain reduction is not zero (there is an effect). What technical type of hypothesis test is this?
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