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Old 07-15-2012
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Stats p-value for testing the null hypothesis

You are reading an article detailing a study designed to compare the average body mass index among hypertensive individuals (persons with high blood pressure) to normotensive individuals. The study was conducted using participants in a health plan offered by a large insurance carrier. 200 andomly selected hypertensive participants were compared to 200 randomly selected normotensive participants. The study reports a 95% confidence interval (CI) for the mean difference in BMI between hypertensives and normotensives. The 95% CI is (0.15 kg/m 2 , 2.43 kg/m 2 ). However, no p-value is reported for testing the null hypothesis of no mean difference in BMI between the two groups (a mean difference of 0 kg/mg 2) versus the alternative of a non-zero mean difference. Luckily, you have taken this course, so you are able to determine:

a. the p-value is < .05
b. the p-value is > .05
c. the p-value is exactly .05.
d. the p-value is exactly .009
e. None of the above.
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Old 07-15-2012
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the p-value is < .05
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