4 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 shown 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 independent variable?

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Appeal A Appeal B Middle Working Middle Working Class Class Class Class (%) (%) (%) (%) Contribution No Contribution 28 20 80 48 40 15 30 60 85 70 100 100 100 100