Clinical data concerning the effectiveness of two drugs in treating a particular disease were collected from 10 hospitals. The numbers of patients treated with the drugs varied from one hospital to another. You want to know whether the data present sufficient evidence to indicate a higher recovery rate for one of the two drugs.
a. Test using the sign test. Choose your rejection region so that a is near .05.
b. Why might it be inappropriate to use the Student's t-test in analyzing the data?

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Drug B Nmb Number Percentage Drug A Percentage Hospit n Group Recovered Recovered Number Number Hospi in Group Recovered Recovered 85.4 83.1 80.2 4.5 70.0 81.5 75.4 79.2 85.4 80.4 84 69.8 85.7 74.0 69.0 83.3 68.9 77.8 722 77.4 48 57 20 40 60 27 35 57 48 76 10 10