Exam (elaborations)
USMLE STEP 3 BIOSTATS QUESTIONS WITH CORRECT ANSWERS.
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USMLE STEP 3 BIOSTATS QUESTIONS WITH CORRECT ANSWERS.
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USMLE STEP 3 BIOSTATS QUESTIONSWITH CORRECT ANSWERS
Standard ppdeviation pp- ppAnswer pp1 ppSD pp68%
2 ppSD pp95% pp(27% ppabove pp1SD, pp13.5 ppon ppeither ppside)
3 ppSD pp99.7% pp(5% ppabove pp2 ppSD, pp2.5 ppon ppeither ppside)
Mean pp- ppAnswer ppaverage ppof ppa ppgroup ppof ppnumber
Median pp- ppAnswer ppthe ppmiddle ppnumber ppwhen pparrange ppin pporder
Mode pp- ppAnswer ppthe ppnumber ppthat ppappears ppmost
Bell ppcurve pp- ppAnswer ppnormal- ppmean pp= ppmedian pp= ppmode pp
positively ppskewed- ppmean pp> ppmedian pp> ppmode
negatively ppskewed- ppmean pp< ppmedian pp< ppmode
Accurate pp- ppAnswer ppEquivalent ppto ppvalidity pp
What ppthe ppgold ppstandard pptest ppis. ppIf ppsomething ppis pptrue ppit ppis ppaccurate.
Reliability pp- ppAnswer ppReproducible, ppdoesn't ppmean ppaccurate pp(true)
SEM pp- ppAnswer ppMeasure ppod pphow pptightly ppgrouped ppa ppset ppof ppdata ppis. pp
Just ppknow ppthat ppthe ppsmaller ppthe ppSEM, ppthe ppmore ppprecise ppthe ppdata
Z-score pp- ppAnswer ppis pphow ppfar ppyou ppare ppfrom ppthe ppmean
Confidence ppinterval pp- ppAnswer pp95 ppCI ppis ppwhat ppyou ppare pplooking ppfor. pp
When ppan ppoutcome pphas ppCI ppthat ppcross pp1.0 ppit ppis ppnot ppsignificant.
Correlation ppcoefficient pp(r) pp- ppAnswer pplevel ppof ppconnection ppor ppcorrelation ppb/n
pptwo ppgroups pp
+1 pppositive ppcorrelation pp
-1 ppinverse ppcorrelation pp
0 ppno ppcorrelation
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