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NBME Step 2 CK Free 120 Answers

step2ck_free120/Block 1/Question#19 (reveal difficulty score)
A cohort study is conducted to compare the ...
Selection bias ๐Ÿ” / ๐Ÿ“บ / ๐ŸŒณ / ๐Ÿ“–
tags: biostats

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submitted by โˆ—bwdc(697)
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A cohort study (as opposed to a randomized controlled trial) is ripe for selection bias, which occurs when the treatment and control groups are not truly comparable. Matching for some factors (age, gender) doesnโ€™t mean youโ€™ve controlled for all possible confounders. Thatโ€™s what randomization does!

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tinylilron  This one tripped me up and I selected Type I error but I guess the p value= 0.01 so Type 1 is less likely... Am I thinking about this correctly? +

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submitted by โˆ—azibird(279)
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Still confused about this one. I guess it depends how you read that last line:

"Which of the following potential flaws is most likely to invalidate this study?"

If you read it as which flaw is most likely to be present, then I guess selection bias is most likely.

If you read it as which flaw, if present, is most likely to invalidate the study, then that type I error would be 100% likely to sink the results, guaranteed. Guess they meant the first one... Because yes p=0.01 so it's not likely they had a type 1 error.

Beef with this q.

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