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#1
04-05-2011
 USMLE Forums Guru Steps History: Step 1 Only Posts: 487 Threads: 95 Thanked 1,501 Times in 361 Posts Reputation: 1511
High Yield Question #9

Two cross sectional studies were conducted using different questionnaires to determine the prevalence of over the counter analgesics use in a population. The first study showed the prevalence of 7.5% (95% confidence interval 6.0-9.0), and the second study demonstrated the prevalence of 7.3% (95% confidence interval 6.9-7.6). If the true prevalence of over the counter analgesics use in the population is 7.4%. Which of the following statements about the results of the study is the most accurate.

A) The first study results are more specific
B) The second study results are more sensitive
C) The first study results are more valid
D) The first study results are more accurate
E) The second study result are more precise
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#2
04-05-2011
 USMLE Forums Master Steps History: 1+CK+CS Posts: 590 Threads: 31 Thanked 1,270 Times in 416 Posts Reputation: 1294

I would choose E
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#3
04-05-2011
 USMLE Forums Master Steps History: 1+CK+CS+3 Posts: 1,357 Threads: 194 Thanked 3,372 Times in 906 Posts Reputation: 3382

NARROW 95%CI...

E) The second study result are more precise
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#4
04-05-2011
 USMLE Forums Scout Steps History: 1 + CK Posts: 91 Threads: 17 Thanked 118 Times in 38 Posts Reputation: 128

I choose E
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#5
04-05-2011
 USMLE Forums Guru Steps History: Step 1 Only Posts: 487 Threads: 95 Thanked 1,501 Times in 361 Posts Reputation: 1511
E) The second study result are more precise

Correct ans is E) The second study result are more precise

Mondoshawan posted an excellent diagrams depict the actual steps that explain the answer regarding this qn. This is very helpful to understand the different b/w precise and accuracy of the study and also explains the reliability and validity respectively.

Precision is the measure of random error in the study. The study is precise, if the results are not scattered widely (Diagram B), that is reflected by a tight confident interval. Note: increasing the sample size will increase the precision.
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#6
04-06-2011
 USMLE Forums Veteran Steps History: 1 + CS Posts: 216 Threads: 56 Thanked 128 Times in 62 Posts Reputation: 128

where are these questions from? either they're kinda easy or I'm really underestimating of how much i know!
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#7
04-06-2011
 USMLE Forums Master Steps History: 1+CK+CS Posts: 590 Threads: 31 Thanked 1,270 Times in 416 Posts Reputation: 1294

Quote:
 Originally Posted by Dr_Kal_El where are these questions from? either they're kinda easy or I'm really underestimating of how much i know!
Well, having just taken the step, perhaps what aktorque feels to be high-yield rings a bell somehow in terms of representative concepts...
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#8
07-26-2011
 USMLE Forums Addict Steps History: Not yet Posts: 151 Threads: 39 Thanked 65 Times in 39 Posts Reputation: 75
E

E) The second study result are more precise
#9
07-26-2011
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#10
03-30-2017
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Ans is E. Important concept,thanks
#11
04-15-2017
 USMLE Forums Scout Steps History: Not yet Posts: 17 Threads: 6 Thanked 2 Times in 1 Post Reputation: 12

Quote:
 Originally Posted by bebix NARROW 95%CI... E) The second study result are more precise
What is wrong with D
#12
04-17-2017
 USMLE Forums Veteran Steps History: Step 1 Only Posts: 234 Threads: 32 Thanked 25 Times in 23 Posts Reputation: 35

i will be going with E
#13
04-17-2017
 USMLE Forums Guru Steps History: 1 + CK Posts: 314 Threads: 9 Thanked 54 Times in 49 Posts Reputation: 64

The second study result are more precise
#14
04-18-2017
 USMLE Forums Scout Steps History: Not yet Posts: 12 Threads: 1 Thanked 0 Times in 0 Posts Reputation: 10
It is E

I think the right answer is E

 Tags Biostatistics-Epidemiology, Figures-, Step-1-Questions

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