A large school district has several middle schools. Three schools were randomly chosen, and four classes were

Question:

A large school district has several middle schools. Three schools were randomly chosen, and four classes were selected from each. The numbers of pupils in each class are shown here. At Î± = 0.10, is there sufficient evidence that the mean number of students per class differs among schools?

MS 2 28 22 25 30 MS 1 MS 3 25 20 23 22 21 25 19 17