12. High cholesterol levels in people can be reduced by exercise, diet, and medication. Twenty middle-aged males with cholesterol readings between 220 and 240 milligrams per deciliter (mg/dL) of blood were randomly selected from the population of such male patients at a large local hospital. Ten of the 20 males were randomly assigned to group A, advised on appropriate exercise and diet, and also received a placebo. The other 10 males were assigned to group B, received the same advice on appropriate exercise and diet, but received a drug intended to reduce cholesterol instead of a placebo. After three months, post-treatment cholesterol readings were taken for all 20 males and compared to pretreatment cholesterol readings. The tables below give the reduction in cholesterol level (pretreatment reading minus post-treatment reading) for each male in the study.

M Inbox - > kiskisc > Compu > Compu > highscourse * Course | Classw | Steve J |M Inbox - |M Inbox( > jupiter Ju X E David + X -> C & https://login.jupitered.com/0/student.php?sz=b6468a5c&w=52895,2949731,0 Prefs Done 12. High cholesterol levels in people can be reduced by exercise, diet, and medication. Twenty middle-aged males with cholesterol readings between 220 and 240 milligrams per deciliter (mg/dL) of blood were randomly selected from the population of such male patients at a large local hospital. Ten of the 20 males were randomly assigned to group A, advised on appropriate exercise and diet, and also received a placebo. The other 10 males were assigned to group B, received the same advice on appropriate exercise and diet, but received a drug intended to reduce cholesterol instead of a placebo. After three months, post-treatment cholesterol readings were taken for all 20 males and compared to pretreatment cholesterol readings. The tables below give the reduction in cholesterol level (pretreatment reading minus post-treatment reading) for each male in the study. Group A (placebo) Reduction (in my/dL) 2 19 8 4 12 8 17 7 24 Mean Reduction: 10.20 Standard Deviation of Reductions: 7.66 Group B (cholesterol drug) Reduction (in mg/dL) 30 19 18 17 20 -4 23 10 9 22 Mean Reduction: 16.40 Standard Deviation of Reductions: 9.40 a) Create a 95% confidence interval for the true difference in cholesterol reduction for patients using the drug vs. a placebo. b) Based on your interval above, should the researchers conclude that the drug reduces mean cholesterol level better than exercise and diet alone? Explain. a e p. 15 of 15 . Type here to search O O 7. ' ) ) 3:44 PM 4/18/2021