Two different drugs for deliberating headaches are being analyzed for effectiveness. The analyst uses a random selection of 15 patients to test the first drug and 13 patients for the second drug. For each patient, the analyst records the number of hours of relief from headache as follows:

Test the null hypothesis that number of hours of relief from a headache is equal for both drugs.

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Drug 1 Drug 2 3.5 5.7 2.9 2.4 1.9 3.3 4.3 3.5 2.1 2.4 4.7 1.1 2.7 3.9 2.1 1.7 4.0 3.5 2.4 5.2 4.3 2.2 4.5 3.2 1.8 0.7 3.7 4.1