To calculate a confidence interval for an independent-samples t test, use the:
A) difference between means.
B) difference between medians.
C) mean of the first group only.
D) mean of the second group only.

Question

Quizplus · Accepted Answer

The confidence interval for an independent-samples t test is calculated using the difference between means of the two groups being compared. This is because the aim of the t test is to determine whether the difference between the means is statistically significant. Therefore, the difference between means is used to calculate the standard error of the difference, which is then used to determine the confidence interval.

To Calculate a Confidence Interval for an Independent-Samples T Test