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USMLE STEP 3 BIOSTATS QUESTIONS WITH CORRECT ANSWER1.
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USMLE STEP 3 BIOSTATS QUESTIONS WITH CORRECT ANSWER1.
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USMLE STEP 3 BIOSTATS QUESTIONSWITH CORRECT ANSWERS
Random eeerror ee- eeAnswer eeDefinition: eean eeerror eethat eeoccurs eedue eeto eechance
eeand/or eelimitations eeof eeprecision
Solutions: eecan eebe eereduced eeby eerepeated eemeasurements eeand eeaveraging eeover
eea eelarge eenumber eeof eeobservations
Systematic eeerror ee(bias) ee- eeAnswer eeDefinition: eeAn eeerror eein eethe eestudy eedesign
eeor eethe eeway eein eewhich eethe eestudy eeis eeconducted eethat eecauses eesystematic
eedeviation eeof eefindings eefrom eethe eetrue eevalue
selection eebias ee- eeAnswer eePpl eein eea eegroup eeare eenot eerepresentative eeof eethe
eepopuaton eefrom eewhich eethe eesample eeis eetaken eebc eethe eesampling eeor eethe
eetreatment eeallocation eeis eenot eerandom
solution: eecontrol eefor eeunknown eeconfounder
sampling eebias ee(asertainment eebias) ee- eeAnswer eetype eeof eeselection eebias
when eecertain eeindividuals eeare eenore eelikley eeto eebe eeselected eefor eea eestudy
eegroup, eeresulting eein eea eenonrandom eesample
- eelimits eegeneralizabiltiy
types eeof eesampling eebias: eenonreponse eebias ee- eeppl eedont eereturn eeinfo eefor eethe
eestudy
Attrition eebias ee- eeAnswer eeType eeof eeselection eebias eein eewhich eeselective eeloss eeof
eeparticiants eeto eef/u.
Mostly eeseen eewith eeprosectiv eestudies
Risks eethat eethe eeremaining eeparticipants eedifferent eesystemtically eefrom eethose eelost
eeto eef/u
berkson eebias ee- eeAnswer eetype eeof eeselection eebias
ppl eein eesample eegroups eethat eeare eedrawn eefrom eea eehospital eepop eeare eemore
eelikley eeto eebe eeill eethen eepp eein eethe eegenral eepop
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