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#1
07-15-2012
 USMLE Forums Master Steps History: 1+CK+CS Posts: 1,867 Threads: 149 Thanked 2,087 Times in 1,047 Posts Reputation: 2107
2 sided p-value for testing the null hypothesis

A study of 100 patients is performed to determine if cholesterol levels are lowered after 3 months of taking a new drug. Cholesterol levels are measured on each individual at the beginning of the study and 3 months later. The cholesterol change is calculated which is the value at 3 months minus the value at the beginning of the study. On average the cholesterol levels among these 100 patients decreased by 15.0 and the standard deviation of the changes in
cholesterol was 40. What can be said about the 2 sided p-value for testing the
null hypothesis of no change in cholesterol levels?

(a) The p value is less than. 05
(b) The p value is greater than .05
(c) The p value is equal to .05
(d) Cannot be determined from the information given

#2
07-15-2012
 USMLE Forums Master Steps History: 1+CK+CS Posts: 646 Threads: 52 Thanked 761 Times in 256 Posts Reputation: 772

(b) The p value is greater than .05

 Tags Biostatistics-Epidemiology, Step-2-Questions

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