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* Biostat q discussion
 #860854  
  selusmle3 - 12/27/19 19:14
 
  To protect blood supplies from contamination , screening all donors for heptitis C is reqiured .This screening has 95% sensitivity and 90 % specificity and is used on donors in which 10% are known to have heptitis C infection .Which one of the following is the best estimate of the chance of that donor who tests negative is actually free of the infection ?

A- 45%
B- 95%
C- 85 %
D-90 %
E - 95%
F- 99%
 
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* Re:Biostat q discussion
#3386335
  selusmle3 - 12/28/19 14:07
 
  ????  
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* Re:Biostat q discussion
#3386336
  davidhope2019 - 12/28/19 14:35
 
  ANswer D  
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* Re:Biostat q discussion
#3386348
  selusmle3 - 12/28/19 18:01
 
  thanks davidhope2019 , Any other suggestion pls ?
I think it would help if we drop our justification if possible .
 
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* Re:Biostat q discussion
#3386353
  britfelo - 12/29/19 00:00
 
  F.  
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* Re:Biostat q discussion
#3386358
  britfelo - 12/29/19 06:20
 
  Sorry, I meant to say 95% which is E  
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* Re:Biostat q discussion
#3386359
  britfelo - 12/29/19 06:47
 
  810/ 860 = 95%  
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* Re:Biostat q discussion
#3386360
  selusmle3 - 12/29/19 13:07
 
  Thanks britfelo , it says the answer is F -99 % but I dont understand why .  
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* Re:Biostat q discussion
#3386361
  britfelo - 12/29/19 14:12
 
  who said it is F?
 
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* Re:Biostat q discussion
#3386362
  selusmle3 - 12/29/19 14:23
 
  A study is conducted to assess the relationship between plasma homocysteine level and foiic acid intake . The investigator demonstrate that the plasma homocysteine level is inversly related to folic acid intake, and the correlation coefficient is -0.8 (p < 0.01) .According to the information provided how much of the variability in plasma homocysteine level is explained by folic acid intake ?
A > 0.99

B 0.8

C 0.64

D 0.55

E < 0.01
 
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* Re:Biostat q discussion
#3386363
  selusmle3 - 12/29/19 14:28
 
  the answer on kaplan q bank - say F  
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