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#1




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 6.09.0), and the second study demonstrated the prevalence of 7.3% (95% confidence interval 6.97.6). 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




I would choose E

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#3




NARROW 95%CI...
E) The second study result are more precise 
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#4




I choose E

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#5




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




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




Well, having just taken the step, perhaps what aktorque feels to be highyield rings a bell somehow in terms of representative concepts...

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#8




E
E) The second study result are more precise

#9




the answer is E

#10




Ans is E. Important concept,thanks

#11




What is wrong with D

#12




i will be going with E

#13




The second study result are more precise 
#14




It is E
I think the right answer is E

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BiostatisticsEpidemiology, Figures, Step1Questions 
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