3. A researcher is interested in whether exercise affects mood. She tests the mood levels of 30 college students (1- very sad mood to 10 - very happy mood). She has them exercise for a half hour per day for one month. After the month, she again measures their mood scores. She is interested in whether there is a difference in mood scores from before to after treatment. A. What kind oft test should the researcher conduct? (4 points) b. Using symbols or words, state the hypotheses. (6 points) c. Assume the calculated t value was greater than the critical t value (that is, it fell in the critical region). State the statistical decision and make a conclusion statement. (6 points) d. Make decisions about the conclusions bolow: (6 points)