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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
Null hypothesis or what

Measurements on a (random) sample of babies born to mothers who took “Prescription Drug A” during pregnancy were compared to measurements on a (random) sample of babies born to mothers who did not take “Prescription Drug A”. A statistically significant difference in the mean head circumference was found between children born to the two groups of mothers (p = .03). Based only on this information you can conclude:

a. There is a 3% chance the null hypothesis is true.
b. Taking “Prescription Drug A” during pregnancy causes a reduction in child’s head circumference.
c. Taking “Prescription Drug A” is associated with an increased child head circumference.
d. The sample mean difference in children’s head circumference between children born to the two groups of mothers is clinically important/significant.
e. None of the above

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

a. There is a 3% chance the null hypothesis is true.
#3
07-15-2012
 USMLE Forums Veteran Steps History: 1+CK+CS Posts: 257 Threads: 69 Thanked 122 Times in 63 Posts Reputation: 132

a is the answer.

 Tags Biostatistics-Epidemiology, Step-2-Questions

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