Biostatistics Quiz
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HYPOTHESIS TESTING
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A pharmaceutical company tests a new antihypertensive medication using a randomized crossover design. Each of 16 patients receives both the new drug and a placebo in random order, with a 2-week washout period between treatments. Systolic blood pressure is measured after each treatment period.
The mean difference in systolic BP (new drug - placebo) is -12.4 mmHg with a standard error of 3.1 mmHg. When testing the hypothesis that the new drug has no effect, what is the most accurate statement about the degrees of freedom and critical value for a two-tailed test at α=0.05\alpha = 0.05?
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