BSNS112 EXAM WITH CORRECT QUESTIONS AND ANSWER

BSNS112 EXAM WITH CORRECT QUESTIONS AND
ANSWERS


Whatydoesyquantitativeydatayuse?y-yCORRECTyANSWER-Means

Whatyisydiscreteydata?y-yCORRECTyANSWER-
Quantitative.yMeasuredyinyspecificyvalues

Whatyisycontinuousydata?y-yCORRECTyANSWER-
Quantitative.yMeasureyinyinfiniteyvalues

Whatydoesyqualitativeydatayuse?y-yCORRECTyANSWER-Proportions

Whatyisyordinalydata?y-yCORRECTyANSWER-Qualitative.yConveysyayranking

Whatyisynominalydata?y-yCORRECTyANSWER-Qualitative.yUsesylabelsy(noyranking)

Whatyvariablesydoesyaycrossytabulationytableyuse?y-yCORRECTyANSWER-
Categoricalyandycategorical

Whatyvariablesydoesyayscatteryplotyuse?y-yCORRECTyANSWER-
Numericalyandynumerical

Whatyvariable(s)ydoesyayfrequencyytableyuse?y-yCORRECTyANSWER-
Oneycategoricalyvariable

Whatyvariablesydoesyaystacked/clusteredybarychartyuse?y-yCORRECTyANSWER-
Categoricalyandycategorical

Whatyvariablesydoesyayrelativeyfrequencyyhistogramyuse?y-yCORRECTyANSWER-
Categoricalyandynumerical

Defineymeany-yCORRECTyANSWER-Simpleyaverage

Defineymediany-yCORRECTyANSWER-Middleyvalueywhenydatayisyranked

Defineymodey-yCORRECTyANSWER-Mostyfrequentyvalue

Defineytrimmedymeany-yCORRECTyANSWER-
Averageywhenymostyextremey5%yofydatayisycut

Defineyrangey-yCORRECTyANSWER-maximumy-yminimum

,Defineyinterquartileyrangey-yCORRECTyANSWER-75thypercentiley-y25thypercentile

Defineyvariancey-yCORRECTyANSWER-spreadyofydatayaroundymeany(σ²)

Whatyhappensywhenystandardydeviationyincreases?y-yCORRECTyANSWER-
Graphywidens

Defineycoefficientyofyvariationy-yCORRECTyANSWER-
Comparesyvariabilityybetweenygroupsywithydifferentymagnitudes

Coefficientyofyvariationyequationy-yCORRECTyANSWER-
SDy/yx̅ywhereyx̅yisytheysampleymean

Whatydoesyitymeanybyyaypositivelyyskewedygraph?y-yCORRECTyANSWER-
Tailytrailsytoytheyright.yMeany>yMediany>yMode

Whatydoesyitymeanybyyaynegativeyskewedygraph?y-yCORRECTyANSWER-
Tailytrailsytoytheyleft.yModey>yMediany>yMean

Whenyisyaygraphysignificantlyyskewed?y-yCORRECTyANSWER-
Skewnessymoreythanytwiceytheystandardyerror

Defineykurtosisy-yCORRECTyANSWER-
Measureyofytheyextentytoywhichyobservationsyclusteryaroundyaycentralypoint

Whatyisytheynormalydistributionykurtosisyvalue?y-yCORRECTyANSWER-0

Defineypositiveykurtosisy-yCORRECTyANSWER-Datayclustersymoreyinytheycentre

Defineynegativeykurtosisy-yCORRECTyANSWER-Datayclustersylessyinytheycentre

Howyisycross-sectionalydataycollected?y-yCORRECTyANSWER-
Byyobservingymanyysubjectsyatytheysameypointyofytime,yorywithoutyregardytoydifferen
cesyinytime

Whatyisytime-seriesydata?y-yCORRECTyANSWER-
Aysequenceytakenyatysuccessiveyequallyyspacedypointsyinytimey(discrete-timeydata)

Defineyassociationy-yCORRECTyANSWER-Howyoneyvariableyrelatesytoyanother

Defineycovariancey-yCORRECTyANSWER-Measureyofytheyco-
movementybetweeny2yvariablesy(measuredyinyunits)

Defineypositiveycovariancey-yCORRECTyANSWER-
2yvariablesymoveyinytheysameydirection

, Defineynegativeycovariancey-yCORRECTyANSWER-
2yvariablesymoveyinytheyoppositeydirection

Defineytheycorrelationycoefficienty-yCORRECTyANSWER-
Measureyofytheylinearyrelationshipybetweeny2yvariablesy(scaledytoyequalyayvalueybet
weeny-1yandy+1)

Defineypositiveycorrelationy-yCORRECTyANSWER-
2yvariablesymoveyinytheysameylinearydirection

Defineynegativeycorrelationy-yCORRECTyANSWER-
2yvariablesymoveyinytheyoppositeylinearydirection

Defineyparametery-yCORRECTyANSWER-
Aysummaryymeasureythatydescribesyaycharacteristicyofytheypopulation

Defineystatisticy-yCORRECTyANSWER-
Aysummaryymeasureythatydescribesyaycharacteristicyofyaysample

Defineysimpleyrandomysamplingy-yCORRECTyANSWER-
Everyoneyisyequallyylikelyytoybeychosenyfromyaypopulation

Defineysystematicyrandomysamplingy-yCORRECTyANSWER-
Selectingy1yindividualyfromyaygroupyandychoosingytheykthyindividualythereafter

Defineystratifiedyrandomysamplingy-yCORRECTyANSWER-
Dividingytheypopulationyintoyhomogenousygroupsyofysimilarycharacteristicsyandysele
ctingyayrandomysampleyfromyeachygroup

Defineyclusterysamplingy-yCORRECTyANSWER-
Dividingytheypopulationyintoyseveralyclustersy(thatyaren'tyhomogenous),yandytakingy
ayrandomysampleyfromyeachycluster

Howyareynonysamplingyerrorsycaused?yIsyityavoidable?y-yCORRECTyANSWER-
Byyhowytheypersonysamples.yItyisyhumanyerroryandyisyavoidable

Whatyisycoverageyerror?y-yCORRECTyANSWER-
Nonysamplingyerror.yDifferenceybetweenysampleypopulationyandytargetypopulationy(
dueytoyselfyselectionyoryselectionybias)y—ywrongysubjects

Whatyisynon-responseyerror?y-yCORRECTyANSWER-
Nonysamplingyerror.ySubjectyfromytheysampleychoosesynotytoyrespondyandyimpactsyo
nytheydata