13. Recovery Rates Clinical data concerning the effectiveness of two drugs in treating a particular condition (as measured by recovery in 7 days or less) were collected from 10 hospitals. 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 A Number Number In Recovered Percentage Hospital Group (7 days or less) Recovered 1 84 63 75.0 234567820 63 44 69.8 56 48 85.7 77 57 74.0 29 20 69.0 48 40 83.3 61 42 68.9 45 35 77.8 9 79 57 72.2 10 62 48 77.4 Drug B Number Hospital Number in Group Recovered (7 days or less) Percentage Recovered 1234 96 82 85.4 83 69 83.1 91 73 80.2 47 35 74.5 5 60 42 70.0 6 27 22 81.5 7 69 52 75.4 8 72 57 79.2 9 89 76 85.4 10 46 37 80.4