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Old 04-28-2014
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Arrow 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.
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  #2  
Old 04-28-2014
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is it b? beta error
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  #3  
Old 04-29-2014
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Quote:
Originally Posted by doctor drake View Post
is it b? beta error
yes, but was ur answer?
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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Old 04-29-2014
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Answer is B.
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