There are many books to help people learn to use computer software packages.

An instructor checked these books and found that they are all of similar quality.

He picked four books and used them in his classes. If the students have the same average grades, he will use the cheapest book. On the basis of the test results that follow, do you think the four classes have about the same grades? Do a 5 %

test.

Transcribed Image Text:

Class W 43 45 67 68 73 72 55 62 XFK85860 77 72 75 69 67 66 63 Y 72 73 71 65 68 69 73 72 Z 72 74 75 65 66 68 74 81