Which of the Following Is True of the T-Test

Multiple Choice

Which of the following is true of the t-test?

A) The t-test is used to analyze the difference between two means.
B) The dependent t-test determines differences in the mean between two independent groups.
C) When the test is used on a single group that yields pretreatment and posttreatment scores, it is known as a t-test for independent samples.
D) a and c