In a study to compare two different methods of teaching reading, a class of thirty children was divided into two groups at random. Each group was taught reading using one method. After six months the two groups were given the same test. One pupil in the first group was ill and missed the test. The scores are given below.

Method 1 80 85 79 81 89 73 50 71 76 87 72 85 86 85

Method 2 79 62 75 68 62 73 76 81 73 61 72 68 75 63 62

(a) Calculate the extreme values and the quartiles for each group.

(b) Hence draw box-and-whisker plots for the two groups using the same scale.

(c) Comment on the differences between the two groups.