The following data set contains the marks of 30 students in two courses. Assume that the variances for the classes are 9 and 16 respectively. 1. Find the confidence Intervals for each class? Where a =...

Extracted text: The following data set contains the marks of 30 students in two courses. Assume that the variances for the classes are 9 and 16 respectively. 1. Find the confidence Intervals for each class? Where a = 0.05; 0.1. 2. Discuss your results? 1 Students X Y 1 90 120 2. 99 130 3 80 105 4 75 110 80 115 6. 80 99 88 105 8 99 130 9. 90 125 10 90 110 11 80 108 12 80 99 13 85 102 14 80 101 15 88 121 16 90 125 17 90 125 18 92 10 19 80 118 20 70 100 21 80 105 22 80 110 23 88 120 24 85 110 25 90 125 26 80 L18 118 27 75 99 28 80 102 29 85 101 30 80 121