15.20 Recovery Rates 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 0.05.

b. Why might it be inappropriate to use the Student's t test in analyzing the data?

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Hospital Number in Group Drug A Number Percentage Recovered Recovered 10 -234569OGO 84 63 75.0 63 44 69.8 56 48 85.7 77 57 74.0 29 48 7 61 8 428 45 79 ORAN 20 69.0 40 83.3 42 68.9 35 77.8 57 72.2 62 48 77.4