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

Explanation

Student's t-test compares the means of two groups to judge if they differ.

It suits small samples when the population variance is unknown.

Comparing means of more than two groups requires analysis of variance.

Testing stationarity of a time series uses unit root tests, not the t-test.

Goodness of fit of a model is assessed by the chi-square test.

The t-test assumes roughly normal data and independent observations.

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