What is the impact of Readiness Assurance Quizzes (RAQs) on final exam scores? Independent and random samples of 40 students each were assigned to a RAQ section and a non RAQ section. Scores on the final exam were recorded for both samples. If you wish to test whether there is a difference in the true mean final exam scores between RAQ and non RAQ sections, what is the correct alternative hypothesis (Ha)?

Select one:
a. Ha: (x bar 1 minus x bar 2) not equal to 0
b. Ha: (mu 1 minus mu 2) > 0
c. Ha: (mu 1 minus mu 2) not equal to 0 CORRECT
d. Ha: (mu 1 minus mu 2) < 0