b. Avoid wordy stems by removing irrelevant data:
Poor Example
Suppose you are a mathematics professor who wants to determine whether or not your teaching of a unit on probability has had a significant effect on your students. You decide to analyze their scores from a test they took before the instruction and their scores from another exam taken after the instruction. Which of the following t-tests is appropriate to use in this situation?
*a. Dependent samples.
b. Heterogenous samples.
c. Homogenous samples.
d. Independent samples.