Question

what does a t-test primarily compare? tests how tall two different ts are predication between the highs and lows compares the means of two different groups

Explanation:

A T - test is a statistical test. The first option is a nonsensical interpretation of "T - test" (relating it to the height of the letter 'T'). The second option is not a correct description of what a T - test does. A T - test is primarily used to compare the means of two different groups (for example, in independent samples T - test, or paired samples T - test to compare means of related groups) to determine if there is a significant difference between them.

Answer:

compares the means of two different groups