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#1
07-15-2012
 USMLE Forums Master Steps History: 1+CK+CS Posts: 1,867 Threads: 149 Thanked 2,106 Times in 1,049 Posts Reputation: 2126
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.

#2
07-15-2012
 USMLE Forums Master Steps History: 1+CK+CS Posts: 646 Threads: 52 Thanked 762 Times in 256 Posts Reputation: 773

the p-value is < .05

 Tags Biostatistics-Epidemiology, Step-2-Questions

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