For the following studies, indicate whether a repeated measures t test is the appropriate analysis. Explain your answers.
a. A researcher is comparing the amount of time spent playing video games each week for college males versus college females.
b. A researcher is comparing two new designs for cell phones by having a group of high school students send a scripted text message on each model and measuring the difference in speed for each student.
c. A researcher is evaluating the effects of fatigue by testing people in the morning when they are well rested and testing again at midnight when they have been awake for at least 14 hours.