12 An instructor asks his statistics class, on the first day of classes, to rate how much they like statistics, on a scale of 1 to 10 (1 hate it, 10 love it). Then, at the end of the semester, the instructor asks the same students, the same question. The instructor wants to know if taking the stats course had an impact on the student's feelings about statistics. The results of the two ratings are presented below. Student Pre-test (first day) Post-test (end of semester) 1 LDOOVCDU'l-bUJMH mmm-bNNN-bm magmwwooouo'lh ,_t O 13. As described, the experiment has a pretty serious confounding variable that is due to measuring people twice, these types of confounding variables are known as effects 9.13 The difference scores for the subjects can be thought of as a measure of the effect of the variable on each subject. 9.14 Can a dependent t test ever be done on two groups of people? Yes or No and explain your