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NBME 24 Answers

nbme24/Block 4/Question#28 (27.1 difficulty score)
A clinical study is designed to evaluate the ...
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 +6 
submitted by m-ice(340),
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The lok"ilhoide of sgisinm an caoi"saiotsn rfsere ot eypT II e.rror heT krsi fo yeTp II rorer si rnpseeetrde yb be.ta ihTs could eb nosudfce wiht ,wreop ichhw is 1 - .ebta

usmleuser007  Just rereading this question without the stress, i got it quickly! Could't believe i missed something as simple as this. +2  
snripper  Can't believe I spent 5 minutes on this and still got it wrong lmao. I was like, "it can't be 90% chance of missing an association, that's way too high." But I picked it nontheless... +1  



 +2 
submitted by abhishek021196(61),

Type II error (β) Stating that there is not an effect or difference when one exists (null hypothesis is not rejected when it is in fact false).

β is the probability of making a type II error. β is related to statistical power (1 – β), which is the probability of rejecting the null hypothesis when it is false.

Increase power and Decrease β by: Increased sample size Increased expected effect size Increased precision of measurement

Also called false-negative error. β = you blindly let the guilty man go free.

If you increase sample size, you increase power. There is power in numbers.