Paper 1 · Research Aptitude
UGC NET June 2023 (17.06.2023) Shift-II
The Student's t-test is typically used
AIn comparing two groups to see if their means differ ✓ Correct
BIn comparing multiple groups to see if their means differ
CIn testing the stationarity of a time series
DIn testing the goodness of fit of a model
Correct answer: (A) In comparing two groups to see if their means differ — The t-test compares the means of two groups, so the answer is comparing two groups to see if their means differ.
Explanation
★The t-test compares the means of two groups, so the answer is comparing two groups to see if their means differ.
★The Student's t-test checks whether two group means differ significantly.
★It is used in hypothesis testing to judge the effect of a treatment or condition.
★So it directly compares the means of two groups.
★Comparing the means of three or more groups uses analysis of variance, not the t-test.
★Testing the stationarity of a time series uses other, specialised tests.
★Goodness of fit is tested by measures like the chi-square test, not the t-test.
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