Discussion
A one tailed test :
Answer: C
A one tailed test is directional.
In a one-tailed test the alternative hypothesis states the direction of the difference, for example \(H_{1}: \mu \gt \mu_{0}\) or \(H_{1}: \mu \lt \mu_{0}\), and the whole rejection region lies in one tail of the sampling distribution.
A two-tailed test is the non-directional one, with \(H_{1}: \mu \neq \mu_{0}\) and rejection regions in both tails. One-tailed tests are not limited to the normal distribution: t, F and chi-square tests can also be one-tailed.
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