Question 2. (9 points): A prospective study was conducted among 55-59-year-old postmenopausal women looking at the association between the use of postmenopausal hormones and the incidence of breast cancer. Women were categorized as never users, current users or past users by mail questionnaire in 1976 and the incidence of breast cancer wa assessed in the 10-year interval following the questionnaire (1976-1986) by follow-up mail questionnaires. (a) What test can be used to test the overall hypothesis that there is (or is not) a difference in incidence of breast cancer among the three groups? ( 1 point) (b) Implement the test and report a p value. (4 points) (c) If there is a difference among the three groups, does the time of using postmenopausal hormones cffecting oocurence of breast cancer? (4 point) Question 2. (9 points): A prospective study was conducted among 55-59-year-old postmenopausal women looking at the association between the use of postmenopausal hormones and the incidence of breast cancer. Women were categorized as never users, current users or past users by mail questionnaire in 1976 and the incidence of breast cancer wa assessed in the 10-year interval following the questionnaire (1976-1986) by follow-up mail questionnaires. (a) What test can be used to test the overall hypothesis that there is (or is not) a difference in incidence of breast cancer among the three groups? ( 1 point) (b) Implement the test and report a p value. (4 points) (c) If there is a difference among the three groups, does the time of using postmenopausal hormones cffecting oocurence of breast cancer? (4 point)