### All GRE Subject Test: Math Resources

## Example Questions

### Example Question #111 : Probability & Statistics

The purpose of the t test is to do which of the following?

**Possible Answers:**

Compare the means of separate populations.

Test the relationship between five or more variables.

Determine the ability of one variable to predict another.

Compare the significance of multiple variables.

Describe the variance within a population.

**Correct answer:**

Compare the means of separate populations.

Explanation:

A t test is used to compare the means of different groups. A t test score describes the likelihood that the difference in means between two groups is due to chance. The null hypothesis assumes the two sets are equal however, one can reject the null hypothesis with a p value within a particular confidence level.

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### All GRE Subject Test: Math Resources

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