Paper 1 · Research Aptitude
UGC NET December 2023 Re-Exam (14.12.2023) Shift-II
If you wish to test whether a population mean is lower than some hypothesized value, you would apply:
AOne-tailed test ✓ Correct
BTwo-tailed test
CHalf-tailed test
DThree-tailed test
Correct answer: (A) One-tailed test — Testing whether a mean is lower than a value uses a one-tailed test, so that is the answer.
Explanation
★Testing whether a mean is lower than a value uses a one-tailed test, so that is the answer.
★A one-tailed test places the whole critical region on one side of the distribution.
★It is used when the hypothesis predicts a direction, such as lower than a value.
★Here the interest is only in whether the mean falls below, not above, so one side is tested.
★A two-tailed test checks for a difference in either direction and splits the region on both sides.
★Half-tailed and three-tailed tests are not standard statistical procedures.
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