Unit 3: Assignment 3-key

Total grade = 35

TABLE 12-3 Results of Five Hypothetical Studies on the Risk of Breast Cancer Following Childhood Exposure to Tobacco Smoke: Confidence Intervals Study (No. subjects) Relative risk 95% confidence interval Statistically significant A (n = 2500) 1.4 1.2-1.7 Yes B (n = 500) 1.7 0.7-3.1 No C (n = 2000) 1.6 1.2-2.1 Yes D (n = 250) 1.8 0.6-3.9 No E (n = 1000) . 1.7 0.9-2.5 NoQuestion 1 [15] - We look at a study of males versus females mean SAT scores. The mean SAT score for females is 1180 with a standard deviation ofS and for males, the mean SAT score is 1160 with a standard deviation of 6. 1. What is the standard error for the mean SAT score for: I. Females? II. Males? [4] 2. Form a 95% condence interval for the mean SAT score for: I. Females ll. Males [8] 3. Interpret your results [3] Question 2 [10] - A study was done on the proportion of males and females who participate in athletics. 480 females and 530 males participated in the study, where 170 females participated in athleticsand 208 males. 1. What is the sample of females participating in athletics? [1] 2. What is the standard error of the sample proportion of athletes? [2] 3. Construct a 95% confidence interval for the population proportion of females that would participate in athletics. [5] 4. Interpret your results [2]