When a researcher wants to test whether the mean of a population is less than a predicted value, which test does the researcher use?
ATwo-tailed test
BLeft-tailed test ✓ Correct
CRight-tailed test
DA-test
Correct answer: (B) Left-tailed test
Explanation
A left-tailed test is used when the hypothesis states the population mean is less than a predicted value.
A two-tailed test checks for any difference, whether higher or lower.
A right-tailed test checks whether the mean exceeds a predicted value.
An A-test is not a recognised statistical test.
The rejection region for a left-tailed test lies in the lower tail of the distribution.
The direction of the alternative hypothesis fixes which tail is tested.
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