A local health agency is experimenting with two appeal letters, A and B, with which to raise funds. It sends out 400 of the A appeal and 400 of the B appeal (each subsample is divided equally among working-class and middle-class neighborhoods). The agency secures the results show in the following table.
a) Which appeal is the best?
b) Which class responded better to which letter?
c) Is appeal or social class a more powerful independentvariable?

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Appeal A Appeal B Middle Working Middle Workin,g Class Class Class Class 20 80 100 40 60 100 30 70 100 Contribution 15 85 100 No Contribution Total