CPH Exam Practice Questions
p p p
Theplengthspofpstaypforpsixppatientspwerep0,p0,p1,p2,p2,pandp16pdays.pWhichpisp(are)pthepbestp
measure(s)ptopsummarizepthesepdata?
A) Mean
B) Median
C) MedianpandpSD
D) MeanpandpSD
E) MedianpandpRangep
E)pMedianpandpRange
Anpepidemiologistpattemptsptoppredictpthepweightpofpanpelderlyppersonpfrompdemispan.pS
heprandomlypchoosesp70pelderlypsubjectspinpapparticularpgeographicpareapandprecordspth
eirpweightpandpdemispanpmeasurementspinpthepformpofp(xpip,pypip)pforpip=p1 ........ 70.pGiven
thatpthepvaluepofpthepPearsonpcorrelationpcoefficientpispzero,pwhatpcanpbepdeduced?
1)pTherepispnoprelationpbetweenpweightpandpdemispan
B) Therepispanpalmostpperfectprelationshippbetweenpweightpandpdemispan
C) Therepcouldpbepsomepnonlinearprelationshippbetweenpweightpandpdemispan
D) Therepispapstrongpnegativeprelationshippbetweenpweightpandpdemispan
E) Allppairspofpvaluespofpweightpandpdemispanpareppracticallypidentical
C)pTherepcouldpbepsomepnonlinearprelationshippbetweenpweightpandpdemispanpWhi
chpofpthepfollowingpstatisticalptestspispNOTpconsideredpapnonparametricptest?
A) Kruskal-WallispTest
B) Wilcoxon'sprank-sumptest
C) Tukey'sptest
D) Mann-Whitneyptest
C)pTukey'sptest
Apresearcherpispdesigningpapnewpquestionnaireptopexamineppatientpstressplevelsponpapscale
pofp0ptop5.pWhatptypepofpoutcomepvariablepispbeingpcollected?
A) Ratio
B) Nominal
C) Interval
D) Ordinal
E) Binary
B)pOrdinal
Inpsimpleplinearpregression,pwhatpispapmethodpofpdeterminingpthepslopepandpinterceptpofpthe
pbest-fittingpline?
A) Leastpsquares
B) R-square
C) Minimumperror
,D) LeastpError
E) Regression
A)pLeastpSquares
Thepsensitivitypofpapparticularpscreeningptestpforpapdiseasepisp95%,pandpthepspecificitypisp90%.
pWhichpofpthepfollowingpstatementspispmostpcorrect?
(A) Ofp100ppeoplepsampledpfrompappopulationpwithpthepdisease,ptheptestpwillpcorrectlypd
etectp95pindividualspasppositivepforpthepdisease
(B) Ofp100ppeoplepsampledpfrompappopulationpwithpthepdisease,ptheptestpwillpcorrectlypd
etectp90pindividuals
(C) Ifpappersonptestsppositive,pthepprobabilitypofphavingpthepdiseasepisp0.95
(D) Ifpappersonphaspthepdisease,ptherepispap5%pchancepthatptheptestpwillpbepnegative
(E) Ifpappersonpdoespnotphavepthepdisease,ptherepispap5%pchancepthatptheptestpwillpbepp
ositive
A)pOfp100ppeoplepsamplespfrompappopulationpwithpthepdisease,ptheptestpwillpcorrectlypdetect
p95pindividualspasppositivepforpthepdisease.
Sensitivitypispthepproportionpofptrulypdiseasedppeoplepinpthepscreenedppopulationpwhoparepid
entifiedpaspdiseasedpbypthepscreeningptest.pItpispapmeasurepofpthepprobabilitypofpcorrectlypdi
agnosingpapcaseporpthepprobabilitypthatpanypgivenpcasepwillpbepidentifiedpbyptheptestp(e.g.,pt
rueppositives).pSpecificitypispthepproportionpofptrulypnon-
diseasedppeoplepwhoparepsopidentifiedpbypthepscreeningptest.pItpispapmeasurepofpthepproba
bilitypofpcorrectlypidentifyingpapnondiseasedppersonpwithpthepscreeningptestp(e.g.,ptruepnega
tives).
ThepCentralpLimitpTheorempstatespthat:
A) Thepsamplepmeanpispunbiased
B) Thepsamplepmeanpispapproximatelypnormal
C) Thepparentppopulationpofpthepsamplepdistributionpispnormallypdistributed
D) ThepsamplepSDpispapproximatelypnormal
E) BothpstatementspA)pandpC)pcanpbepdeducedpfrompthepCentralpLimitpTheorem
B)pThepsamplepmeanpispapproximatelypnormal
ThepCentralpLimitpTheorempstatespthatpifpthepsamplepsizepisplargepenough,pthepdistributionpo
fpthe
samplepmeanspcanpbepapproximatedpbypapnormalpdistribution,pevenpifptheporiginalppopulationp
ispnot
normallypdistributed.pInpotherpwords,pthepdistributionpofpthepsamplepmeanspapproachespapnor
malpdistributionpaspthepsamplepsizepincreases
Assumepthatpapresearcherphaspmeasuredpweightpinpapsamplepofp100poverweightpadultspbefo
repandpafterpapdietpandpexercisepprogrampconductedpatptheplocalphealthpdepartment'spweeklyp
EatpHealthp-pBepFitpcommunitypprogram.
Topdeterminepwhetherpthepmeanpweightpdecreasedpsixpweekspafterpthepexercisepprogrampc
omparedptopthepinitialpbaselinepmeasures,pthepresearcherpshould:
A) Computepthepcorrelationpcoefficient,pr,pandpdeterminepthepassociationpbetweenpbeing
,overweightpandpthepcommunitypprogram
B) Conductpapt-testpforpindependentpsamples
C) Conductpapt-testpforpdependentpsamples
D) Conductpapchi-squareptestpforpassociation
E) Notpestimatepthepdecreasepbecauseptherepwaspnopcontrolpgrouppforpthepprogram
C)pConductpapt-testpforpdependentpsamples
Apt-
testpispaphypothesisptestptopcompareppopulationpmeanspandpproportions.pInpthispcase,pthepsa
mplepis
dependentpbecauseptheptestsparepperformedponpthepsamepindividualspinpthepsample.pWhic
hpofpthepfollowingpestimatespofpanpoddspratiopmostpstronglypsuggestspapcomputationalperro
r?
1)p7.8
2)p1.2
3)p-0.9
4)p20.9
3)p-0.9
Anpoddspratiopofp-
0.9pmostpstronglypindicatespapcomputationalperrorpbecausepanpoddspratiopispcalculatedpusin
gpprobabilities,pwhichpcannotpbepnegative.
Anpoddspratiopispthepprobabilitypthatpanpeventpwillpoccurpdividedpbypthepprobabilitypthatpitpwillp
notpoccur.pSincepprobabilitiespcannotpbepnegative,papnegativepoddspratiopwouldpindicatepc
omputationalperror.
Whichpmeasurepofpmortalitypwouldpyoupcalculateptopdeterminepthepproportionpofpallpd
eathspthatpispcausedpbypheartpdisease?
A) CasepFatalitypRatio
B) RandomizedpClinicalpTrial
C) CrudepMortalitypRate
D) ProportionalpMortalitypRatio
D)pProportionalpMortalitypRatio
thepproportionpofpdeathspinpapparticularppopulationpoverpapspecifiedpperiodpofptimepattributable
ptopapspecificpdisease
Anpincrementalpapproachptopprogrampplanningpinppublicphealthpis:
1) Usespmultiplepsourcespandpmethodsptopcollectpsimilarpinformation
2) Providespanpintensive,pdetailedpdescriptionpandpanalysispofpapsinglepproject
3) Producespapplanpwherepthepspecificationpofpeverypsteppdependspupponpthepresultspofpp
reviouspsteps
4) Resultspinpplanspthatpmaypbepimmediatelypnecessarypbutpmaypoverlapporpleavepgaps
4)pResultspinpplanspthatpmaypbepimmediatelypnecessarypbutpmaypoverlapporpleavepgaps
Thepincrementalpapproachptopprogramp(aplittlepbitpmorepispaddedpeachptime)pplanning
, maypaddresspanpimmediatepneedp(ex:pClosingpbathhousespinpthepearlypdayspofpHIV/AIDSpepi
demic)pitpmaypalsopleavepgapsp(ex:pDidpnotpidentifypthepvirus).
Thepincrementalpapproachptopprogrampplanningpwillpaddressponlyppartpofpthepproblem,pmay
pbepthepresultpofpdisjointedpeffortspandpleavepmanypfactorspunaccountedpfor.
Inpapstatepwithpapstate-
directedppubicphealthporganization,pthepStatepCommissionerpofpHealthphaspnotifiedphealthp
districtsptopclosephealthpdepartmentpdentalpprogramspinpresponseptopapstateplegislaturepvot
eptopdefundpandpdiscontinuephealthpdepartmentpdentalpservices.
Thepdistrictphealthpdepartmentphaspidentifiedpdentalpservicespaspapleadingpcommunityph
ealthpneed.pTophelppassurepcontinuedpaccessptopservices,pthepbestpfirstpsteppispto:
1) Developpaplistpofppossiblepvenuespandpproposalsptopsecurepfinancialpsupport,pandpp
resentpthemptopthepCommissioner'spoffice
2) developpagreementspwithplocalpprovidersporporganizationspforpthepprovisionpofpdentalps
ervices
3) continuepthepdentalpprogrampin-
housepatptheplocalphealthpdepartment,psincepitpwaspalreadypfinanciallypsustainablepandp
heavilyputilized
4) ensurepimplementationpofpcontractspandpotherpagreementspwithpcommunityppartnerspt
opprovidepcommunitypdentalpservices
1)pDeveloppaplistpofppossiblepvenuespandpproposalsptopsecurepfinancialpsupport,pandppresentpt
hemptopthepCommissioner'spoffice
Sincepthepupperpchainpofpstatephealthpcommandphasporderedpdentalpservicepclosure,pconsul
tationpwithpthepCommissioner'spofficepwillpbepneededptopassurepcompliancepwithplegislativepdi
rectivespandpfidelityptopstatephealthpdepartmentppolicy.
Theplikelihoodpofpsupportpfrompthepstate-levelpispgreaterpifpitpispwell-
definedpandpsustainablepoptionspareppresented.
00:0201:25
Apresearcherphaspimplementedpanpintervention.pThepprogrampactivitiespincludepSTDpcouns
elingpforpthepmemberspofpapcommunity-
basedporganization.pOnepoutcomepmeasurepwouldpbepbestpaddressedpbypwhichpofpthepfollo
wingpquestions?
1.)pDidpSTDpcounselingpresultpinpchangespinpknowledgepamongptheptargetppopulation?p2.)p
Whenpdidpthepprogrampactivitiesptakepplace?
3.)pWhatparepthepbarriersptopimplementationpofpprogrampactivities?p4.)p
Whatpispthepnumberpofppeoplepwhopreceivedpcounseling?
1.)pDidpSTDpcounselingpresultpinpchangespinpknowledgepamongptheptargetppopulation?
Outcomepevaluationpmeasurespthepprogrampeffectsponptheptargetppopulation.
p p p
Theplengthspofpstaypforpsixppatientspwerep0,p0,p1,p2,p2,pandp16pdays.pWhichpisp(are)pthepbestp
measure(s)ptopsummarizepthesepdata?
A) Mean
B) Median
C) MedianpandpSD
D) MeanpandpSD
E) MedianpandpRangep
E)pMedianpandpRange
Anpepidemiologistpattemptsptoppredictpthepweightpofpanpelderlyppersonpfrompdemispan.pS
heprandomlypchoosesp70pelderlypsubjectspinpapparticularpgeographicpareapandprecordspth
eirpweightpandpdemispanpmeasurementspinpthepformpofp(xpip,pypip)pforpip=p1 ........ 70.pGiven
thatpthepvaluepofpthepPearsonpcorrelationpcoefficientpispzero,pwhatpcanpbepdeduced?
1)pTherepispnoprelationpbetweenpweightpandpdemispan
B) Therepispanpalmostpperfectprelationshippbetweenpweightpandpdemispan
C) Therepcouldpbepsomepnonlinearprelationshippbetweenpweightpandpdemispan
D) Therepispapstrongpnegativeprelationshippbetweenpweightpandpdemispan
E) Allppairspofpvaluespofpweightpandpdemispanpareppracticallypidentical
C)pTherepcouldpbepsomepnonlinearprelationshippbetweenpweightpandpdemispanpWhi
chpofpthepfollowingpstatisticalptestspispNOTpconsideredpapnonparametricptest?
A) Kruskal-WallispTest
B) Wilcoxon'sprank-sumptest
C) Tukey'sptest
D) Mann-Whitneyptest
C)pTukey'sptest
Apresearcherpispdesigningpapnewpquestionnaireptopexamineppatientpstressplevelsponpapscale
pofp0ptop5.pWhatptypepofpoutcomepvariablepispbeingpcollected?
A) Ratio
B) Nominal
C) Interval
D) Ordinal
E) Binary
B)pOrdinal
Inpsimpleplinearpregression,pwhatpispapmethodpofpdeterminingpthepslopepandpinterceptpofpthe
pbest-fittingpline?
A) Leastpsquares
B) R-square
C) Minimumperror
,D) LeastpError
E) Regression
A)pLeastpSquares
Thepsensitivitypofpapparticularpscreeningptestpforpapdiseasepisp95%,pandpthepspecificitypisp90%.
pWhichpofpthepfollowingpstatementspispmostpcorrect?
(A) Ofp100ppeoplepsampledpfrompappopulationpwithpthepdisease,ptheptestpwillpcorrectlypd
etectp95pindividualspasppositivepforpthepdisease
(B) Ofp100ppeoplepsampledpfrompappopulationpwithpthepdisease,ptheptestpwillpcorrectlypd
etectp90pindividuals
(C) Ifpappersonptestsppositive,pthepprobabilitypofphavingpthepdiseasepisp0.95
(D) Ifpappersonphaspthepdisease,ptherepispap5%pchancepthatptheptestpwillpbepnegative
(E) Ifpappersonpdoespnotphavepthepdisease,ptherepispap5%pchancepthatptheptestpwillpbepp
ositive
A)pOfp100ppeoplepsamplespfrompappopulationpwithpthepdisease,ptheptestpwillpcorrectlypdetect
p95pindividualspasppositivepforpthepdisease.
Sensitivitypispthepproportionpofptrulypdiseasedppeoplepinpthepscreenedppopulationpwhoparepid
entifiedpaspdiseasedpbypthepscreeningptest.pItpispapmeasurepofpthepprobabilitypofpcorrectlypdi
agnosingpapcaseporpthepprobabilitypthatpanypgivenpcasepwillpbepidentifiedpbyptheptestp(e.g.,pt
rueppositives).pSpecificitypispthepproportionpofptrulypnon-
diseasedppeoplepwhoparepsopidentifiedpbypthepscreeningptest.pItpispapmeasurepofpthepproba
bilitypofpcorrectlypidentifyingpapnondiseasedppersonpwithpthepscreeningptestp(e.g.,ptruepnega
tives).
ThepCentralpLimitpTheorempstatespthat:
A) Thepsamplepmeanpispunbiased
B) Thepsamplepmeanpispapproximatelypnormal
C) Thepparentppopulationpofpthepsamplepdistributionpispnormallypdistributed
D) ThepsamplepSDpispapproximatelypnormal
E) BothpstatementspA)pandpC)pcanpbepdeducedpfrompthepCentralpLimitpTheorem
B)pThepsamplepmeanpispapproximatelypnormal
ThepCentralpLimitpTheorempstatespthatpifpthepsamplepsizepisplargepenough,pthepdistributionpo
fpthe
samplepmeanspcanpbepapproximatedpbypapnormalpdistribution,pevenpifptheporiginalppopulationp
ispnot
normallypdistributed.pInpotherpwords,pthepdistributionpofpthepsamplepmeanspapproachespapnor
malpdistributionpaspthepsamplepsizepincreases
Assumepthatpapresearcherphaspmeasuredpweightpinpapsamplepofp100poverweightpadultspbefo
repandpafterpapdietpandpexercisepprogrampconductedpatptheplocalphealthpdepartment'spweeklyp
EatpHealthp-pBepFitpcommunitypprogram.
Topdeterminepwhetherpthepmeanpweightpdecreasedpsixpweekspafterpthepexercisepprogrampc
omparedptopthepinitialpbaselinepmeasures,pthepresearcherpshould:
A) Computepthepcorrelationpcoefficient,pr,pandpdeterminepthepassociationpbetweenpbeing
,overweightpandpthepcommunitypprogram
B) Conductpapt-testpforpindependentpsamples
C) Conductpapt-testpforpdependentpsamples
D) Conductpapchi-squareptestpforpassociation
E) Notpestimatepthepdecreasepbecauseptherepwaspnopcontrolpgrouppforpthepprogram
C)pConductpapt-testpforpdependentpsamples
Apt-
testpispaphypothesisptestptopcompareppopulationpmeanspandpproportions.pInpthispcase,pthepsa
mplepis
dependentpbecauseptheptestsparepperformedponpthepsamepindividualspinpthepsample.pWhic
hpofpthepfollowingpestimatespofpanpoddspratiopmostpstronglypsuggestspapcomputationalperro
r?
1)p7.8
2)p1.2
3)p-0.9
4)p20.9
3)p-0.9
Anpoddspratiopofp-
0.9pmostpstronglypindicatespapcomputationalperrorpbecausepanpoddspratiopispcalculatedpusin
gpprobabilities,pwhichpcannotpbepnegative.
Anpoddspratiopispthepprobabilitypthatpanpeventpwillpoccurpdividedpbypthepprobabilitypthatpitpwillp
notpoccur.pSincepprobabilitiespcannotpbepnegative,papnegativepoddspratiopwouldpindicatepc
omputationalperror.
Whichpmeasurepofpmortalitypwouldpyoupcalculateptopdeterminepthepproportionpofpallpd
eathspthatpispcausedpbypheartpdisease?
A) CasepFatalitypRatio
B) RandomizedpClinicalpTrial
C) CrudepMortalitypRate
D) ProportionalpMortalitypRatio
D)pProportionalpMortalitypRatio
thepproportionpofpdeathspinpapparticularppopulationpoverpapspecifiedpperiodpofptimepattributable
ptopapspecificpdisease
Anpincrementalpapproachptopprogrampplanningpinppublicphealthpis:
1) Usespmultiplepsourcespandpmethodsptopcollectpsimilarpinformation
2) Providespanpintensive,pdetailedpdescriptionpandpanalysispofpapsinglepproject
3) Producespapplanpwherepthepspecificationpofpeverypsteppdependspupponpthepresultspofpp
reviouspsteps
4) Resultspinpplanspthatpmaypbepimmediatelypnecessarypbutpmaypoverlapporpleavepgaps
4)pResultspinpplanspthatpmaypbepimmediatelypnecessarypbutpmaypoverlapporpleavepgaps
Thepincrementalpapproachptopprogramp(aplittlepbitpmorepispaddedpeachptime)pplanning
, maypaddresspanpimmediatepneedp(ex:pClosingpbathhousespinpthepearlypdayspofpHIV/AIDSpepi
demic)pitpmaypalsopleavepgapsp(ex:pDidpnotpidentifypthepvirus).
Thepincrementalpapproachptopprogrampplanningpwillpaddressponlyppartpofpthepproblem,pmay
pbepthepresultpofpdisjointedpeffortspandpleavepmanypfactorspunaccountedpfor.
Inpapstatepwithpapstate-
directedppubicphealthporganization,pthepStatepCommissionerpofpHealthphaspnotifiedphealthp
districtsptopclosephealthpdepartmentpdentalpprogramspinpresponseptopapstateplegislaturepvot
eptopdefundpandpdiscontinuephealthpdepartmentpdentalpservices.
Thepdistrictphealthpdepartmentphaspidentifiedpdentalpservicespaspapleadingpcommunityph
ealthpneed.pTophelppassurepcontinuedpaccessptopservices,pthepbestpfirstpsteppispto:
1) Developpaplistpofppossiblepvenuespandpproposalsptopsecurepfinancialpsupport,pandpp
resentpthemptopthepCommissioner'spoffice
2) developpagreementspwithplocalpprovidersporporganizationspforpthepprovisionpofpdentalps
ervices
3) continuepthepdentalpprogrampin-
housepatptheplocalphealthpdepartment,psincepitpwaspalreadypfinanciallypsustainablepandp
heavilyputilized
4) ensurepimplementationpofpcontractspandpotherpagreementspwithpcommunityppartnerspt
opprovidepcommunitypdentalpservices
1)pDeveloppaplistpofppossiblepvenuespandpproposalsptopsecurepfinancialpsupport,pandppresentpt
hemptopthepCommissioner'spoffice
Sincepthepupperpchainpofpstatephealthpcommandphasporderedpdentalpservicepclosure,pconsul
tationpwithpthepCommissioner'spofficepwillpbepneededptopassurepcompliancepwithplegislativepdi
rectivespandpfidelityptopstatephealthpdepartmentppolicy.
Theplikelihoodpofpsupportpfrompthepstate-levelpispgreaterpifpitpispwell-
definedpandpsustainablepoptionspareppresented.
00:0201:25
Apresearcherphaspimplementedpanpintervention.pThepprogrampactivitiespincludepSTDpcouns
elingpforpthepmemberspofpapcommunity-
basedporganization.pOnepoutcomepmeasurepwouldpbepbestpaddressedpbypwhichpofpthepfollo
wingpquestions?
1.)pDidpSTDpcounselingpresultpinpchangespinpknowledgepamongptheptargetppopulation?p2.)p
Whenpdidpthepprogrampactivitiesptakepplace?
3.)pWhatparepthepbarriersptopimplementationpofpprogrampactivities?p4.)p
Whatpispthepnumberpofppeoplepwhopreceivedpcounseling?
1.)pDidpSTDpcounselingpresultpinpchangespinpknowledgepamongptheptargetppopulation?
Outcomepevaluationpmeasurespthepprogrampeffectsponptheptargetppopulation.
