3 4. A special diet is intended to reduce the cholesterol of patients at risk of heart disease. If the diet is effective, the target is to have the average cholesterol of this heart disease had an average cholesterol of x= 192, with standard deviation s=2 group be below 200. After six months on the diet, an SRS of 50 patients at risk for Is this sufficient evidence that the diet is effective in meeting the target? Assume the distribution of the cholesterol for patients in this group is approximately Normal with mean . Do the appropriate statistical test using a significance level of 0.05. 21. [10] 72 Activities class: 21 No Activities class: 23 % 5. A psychologist has developed a set of activities which she hopes will help children develop better reading skills. In a study of the effectiveness of these activities, one class of second grade children learns with the activities. Another class of second grade children serves as the control, and learned without the activities. After some period of time, the reading skills of all of these children were assessed. A summary of these data is: X 51.48 41.52 S 11.01 17.15 The psychologist suspects that children who learn with activities have higher mean reading skill test scores than children that don't learn with activities. Test the psychologist's claim using the data and a significance level of 0.05 [10].