A pharmaceutical company claims that its new drug reducessystolic blood pressure. The systolic blood pressure (inmillimeters of mercury) for nine patients before taking the newdrug and 22 hours after taking the drug are shown in the tablebelow. Is there enough evidence to support the company's claim?
Let d=(blood pressure before taking new drug)−(blood pressureafter taking new drug)d=(blood pressure before taking newdrug)−(blood pressure after taking new drug). Use a significancelevel of α=0.1α=0.1 for the test. Assume that the systolic bloodpressure levels are normally distributed for the population ofpatients both before and after taking the new drug.
| Patient | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
|---|---|---|---|---|---|---|---|---|---|
| Blood pressure (before) | 201 | 190 | 177 | 193 | 201 | 167 | 170 | 168 | 183 |
| Blood pressure (after) | 184 | 166 | 171 | 185 | 180 | 152 | 149 | 157 | 159 |
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