RD EXAM Pass Questions and Answers Updated 2026

RD EXAM Pass
Questions and Answers
Updated 2026
ObservationalBstudiesB-
BAnswertheBresearchersBdoBnotBchangeBanythingBtheyBjustBgatherBinfo.BTheBresultsB
measureBassociationBorBcorrelationBonBcausation.



ProspectiveBstudiesB-
BAnswer"watchBandBwait",BcollectBdataBthenBwaitBforBoutcomes,BkeyBoutcomesBmeas
uredBafterBexposure.BEx.BsubclinicalBmanifestationsBofBheartBdiseaseBbeforeBheartBatta
ck,BallBRTCs



RetrospectiveB-BAnsweroutcomeBmeasuredBbeforeBexposure



CrossBsectionalB-
BAnswer"snapshot"BexposuresBandBoutcomesBatBtheBsameBtime,BieBNHANES

prevalenceBstudy



CaseBcontrolledB-BAnsweroutcomeBthenBworkBbackwardBtoBmeasureBexposure

PPLBwithBdxBcomparedBtoBcontrols



CohortB-BAnswerexposureBmeasuredBbeforeBtheBoutcomeBdevelopsB

prospectiveBandBretrospective



ExperimentalBstudiesB-BAnswerresearchBthatBmanipulatesBtheBenvironmentB

ifBtheBstudyBisBrandomizedBinferBcausation,BifBnotBcannotBinferBanything



PositiveBcorrelationB-BAnswerxBandByBincreaseBorBdecreaseBtogether

,NegativeBcorrelationB-BAnswerasBoneBvariableBincreases,BtheBotherBdecreases



CorrelationB-BAnswer=Br,BrBrangesBfromB-1BtoB+1,B0B=BnoBrelationship



PairedBcomparisonBtestB-BAnswerakaBpreferenceBtestB

2BsamplesBratedBforBqualities



TringleBtestB-
BAnswer2BofBtheBsameBsampleB1Bdifferent,BaBjudgeBhasBtoBpickBtheBdifferentBsample



QuantitativeBdescriptiveBtestB-BAnswer8-
12Bpeople,BpanelistsBtrainedBonBsensoryBcharacteristics,BrateBtheBsamplesBonBtheseBc
haracteristics



EvidenceBGradesB-BAnswerI=BStrong-BIVBweak/expertBopinionB

V=BinsufficientBevidence



QuantitiveBdataB-
BAnswerinfoBcanBbeBmeasuredBandBwrittenBinBnumbers,BexBofBresearch:BRCTBlooking
BatBoutcomesBofBgroupBmeetingsBonBDMBlabs



QualitativeBdataB-
BAnswerinfoBaboutBbehavior,BieBunderstandingBtheBvarietyBofBchildhoodBexperiencesBa
roundBfood



validityB-
BAnswertheBextentBtoBwhichBaBtestBmeasuresBorBpredictsBwhatBitBisBsupposedBto

internalBdifferenceBbetweenB2BgroupsBreal?

externalB=BCanByouBgenerateBtoBaBlargeBpopulation

,ReliabilityB-
BAnswertheBdegreeBtoBwhichBanBassessmentBtoolBproducesBstableBandBconsistentBres
ultsBieBarrowsBaroundB1BpointB

areBtheBresultsBreproducible?



biasB-BAnswerrelatedBtoBaccuracyBandBvalidityB

howBcloseBisByourBmeasurementBtoB150Blbs?B

=BsystematicBerror



randomBerrorB-BAnswerrelatedBtoBprecisionBandBreliabilityB

howBcloseBareByourBmeasurements?



SensitivityB-BAnswertheBabilityBtoBIDBaBpositiveBDXB

aBtestBwithB100%BwouldBproduceBaBpositiveBresultBinBeveryoneBwithBtheBDXB(noBfals
eBnegatives)



SpecificityB-BAnswerabilityBofBaBtestBtoBIDBthoseBwithoutBtheBDX



PrevalenceB-BAnswerisBtheBnumberBofBexistingBDxBcasesBduringBaBperiodBofBtimeB

=BincidenceBxBduration

overallB=BTPB+BFN/N



incidenceB-BAnswernumberBofBNEWBcasesBthatBdevelopBoverBaBperiodBofBtime



OddsBratioB-
BAnsweraBmeasureBofBassociationBbetweenBaBdependentBandBindependentBvariableBm
ean,Bmedian,BandBmode

, negativeBskewB-BAnswermeanBisBLOWERBthanBmedian



PositiveBskewB-BAnswermeanBisBHIGHERBthanBmedian



descriptiveBresearchB-BAnswerdoBNOTBdetermineBaBrelationshipB

qualitativeBresearchB

caseBreport/BstudyB(novelBdx)B

Correlation/ecologicalBstudies



AnalyticBresearchB-BAnswerexperimental-BcauseBcanBbeBfoundB(RTCs)B

observational-BnoBcause-onlyBassociationB(quasi-experimental,BcohortBstudy,Bcase-
controlBstudy,Bcross-sectionalBstudy)



nominalBvariablesB-BAnswernoBorderBieBgender,BraceBetc



OrdinalBscaleB-
BAnsweraBscaleBofBmeasurementBinBwhichBtheBmeasurementBcategoriesBformBaBrank
BorderBalongBaBcontinuumBieBstageB1Bcancer



numericalBdiscreteB-
BAnswerdataBwithBnumbersB(numberBofBclinicBvisits),BnoBsetBnumber



numericalBcontinuousB-BAnsweronBaBcontinuum

ex.Bheight,Bweight,Btime



StandardBdeviationB-
BAnswerindicatesBtheBdispersionBofBdataBaboutBtheBmeanB(average)B

68%BofBobservationsBlieBwithinBtheBrangeB1BSDBofBmeanB

32%BofBobservationsBlieBoutsideBtheBrangeB(rangB=BmeanB+/-B1BSD)B