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#1
04-28-2014
 USMLE Forums Master Steps History: 1+CK+CS+3 Posts: 592 Threads: 92 Thanked 198 Times in 129 Posts Reputation: 208
BioStat Question for Today - 2

A group of researchers conducted a large double-
blind, randomized trial comparing the effi -
cacy of a new antibiotic with penicillin in treating
streptococcal pneumonia. The results
showed that 95% of the patients taking the new
antibiotic cleared their pneumonia, while 90%
of those taking penicillin cleared their pneumonia.
A large sample size was chosen in order
to generate a statistical power of 80% with a P
value of .21. Which of the following represents
the probability that there is a difference between
the two treatment groups despite the
study’s failure to show this difference?

(A) 0.05
(B) 0.20
(C) 0.21
(D) 0.80
(E) 0.90
(F) 0.95

found it quite interesting, seems difficult but it fact it isnt, very usmle like XD
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Last edited by drpisho; 04-28-2014 at 02:03 PM.

#2
04-28-2014
 USMLE Forums Addict Steps History: Not yet Posts: 130 Threads: 15 Thanked 29 Times in 20 Posts Reputation: 39

is it b? beta error
#3
04-29-2014
 USMLE Forums Master Steps History: 1+CK+CS+3 Posts: 592 Threads: 92 Thanked 198 Times in 129 Posts Reputation: 208

Quote:
 Originally Posted by doctor drake is it b? beta error
i got all confused how to proceed with this, i knew it was b error but clearing the formula on FA messed me up.
__________________
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#4
04-29-2014
 USMLE Forums Master Steps History: 1+CK+CS+3 Posts: 1,109 Threads: 31 Thanked 521 Times in 394 Posts Reputation: 540

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