Four different, though supposedly equivalent, forms of a standardized reading achievement test were given to each of 5 students, and the following are the scores which they obtained:

Treating students as blocks, perform an analysis of variance to test at the level of significance \(\alpha=\) 0.01 whether it is reasonable to treat the 4 forms as equivalent.

Student I Student 2 Student 3 Student 4 Student 5 Form A 75 73 59 69 84 Form B 83 72 56 70 92 Form C 86 61 53 72 88 Form D 73 67 62 79 95