For Which of the Following Would an Independent Samples T-Test

Multiple Choice

For which of the following would an independent samples t-test be most appropriate?

A) examining the performance difference between participants who took an SAT preparation class and participants who did not
B) investigating psychological adjustment following the loss of a loved one
C) a cognitive study examining the difference in three different types of memory aids
D) examining whether one's astrological sign predicts well-being