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STATS MIDTERM QUESTIONS WITH COMPLETE ANSWERS.
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STATS MIDTERM QUESTIONS WITH COMPLETE ANSWERS.
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STATS MIDTERM QUESTIONS WITHCOMPLETE ANSWERS
The bbpopulation bbis bbthe bbentire bbgroup bbfor bbwhich bbyou bbplan bbto bbdraw
bbconclusions. bbThe bb__________ bbis bbthe bbgroup bbthat bbis bbactually bbstudied, bband
bbis bbchosen bbfrom bbthe bbpopulation. bb(Use bbone bbword bbto bbfill bbin bbthe bbblank.) bb-
bbAnswersample
Suppose bbyou bbconduct bban bbobservational bbstudy bbas bbfollows: bbyou bbsurvey bb200
bbpeople bbwho bbhad bbbeen bbon bba bbweight bbloss bbprogram bbfor bbsix bbmonths, bband
bbask bbthem bbwhether bbor bbnot bbthey bbtake bbvitamins bbevery bbday, bband bbhow
bbmuch bbweight bbthey bblost. bbSuppose bbyou bbfound bbthat bbthe bbpeople bbwho bblost
bbthe bbmost bbweight bbwere bbmore bblikely bbto bbhave bbtaken bbvitamins bbevery bbday.
True bbor bbFalse: bbLifestyle bbdifferences, bbinstead bbof bbvitamins, bbmay bbhave
bbcaused bbthe bbweight bbloss. bb- bbAnswertrue
Since bbthis bbwas bbnot bban bbexperiment bbinvolving bbvitamins, bbwe bbdo bbnot bbknow
bbthat bbthe bbvitamins bbcaused bbthe bbweight bbloss. bbThose bbwho bbtook bbvitamins
bbmay bbhave bbbeen bbthe bbmost bbhealth bbconscious bband bbexercised bbmore bbthan
bbaverage, bbfor bbexample. bbIf bbthat bbwere bbthe bbcase, bbit bbcould bbhave bbbeen bbthe
bbexercise bbthat bbcaused bbthe bbgreater bbweight bbloss bbinstead bbof bbvitamins.
Suppose bbyou bbare bbconducting bban bbexperiment bbthat bbinvolves bbassigning bbeach
bbof bb100 bbparticipants bbto bbone bbof bbtwo bbgroups: bbGroup bbA bbor bbGroup bbB.
bbWhich bbof bbthe bbfollowing bbwould bbnot bbbe bbconsidered bbto bbbe bba bbrandom
bbassignment bbof bbparticipants bbto bbgroups?
For bbeach bbparticipant, bbflip bba bbcoin. bbIf bbthe bbcoin bblands bbheads bbup, bbassign
bbthe bbperson bbto bbGroup bbA. bbIf bbthe bbcoin bblands bbtails bbup, bbassign bbthe bbperson
bbto bbGroup bbB.
Put bball bb100 bbnames bbin bba bbhat bband bbmix bbthem bbup bbthoroughly. bbDraw bb50
bbnames bbfrom bbthe bbhat bband bbassign bbthem bbto bbGroup bbA. bbEveryone bbelse bbis
bbassigned bbto bbGroup bbB.
, Recruit bbstudy bbparticipants bbon bbtwo bbdays bb(Sunday bband bbMonday). bbAssign bbthe
bbfirst bb50 bbwho bbshow bbup bbon bbSunday bbto bbGroup bbA, bband bbthe bbfirst bb50 bbwho
bbshow bbup bbon bbMonday bbto bbGroup bbB.
All bbof bbthe bbabove bbmethods bbare bbconsidered bbto bbbe bbrandom bbassignments bbof
bbparticipants bbto bbgroups. bb- bbAnswerRecruit bbstudy bbparticipants bbon bbtwo bbdays
bb(Sunday bband bbMonday). bbAssign bbthe bbfirst bb50 bbwho bbshow bbup bbon bbSunday
bbto bbGroup bbA, bband bbthe bbfirst bb50 bbwho bbshow bbup bbon bbMonday bbto bbGroup bbB.
Observational bbstudies bbare bbas bbgood bbas bbrandomized bbexperiments bbfor
bbpurposes bbof bbdetermining bbcausal bbconnections. bb- bbAnswerfalse
Regarding bbCase bbStudy bb1.2. bb"Does bbAspirin bbPrevent bbHeart bbAttacks?" bbWhich
bbof bbthe bbfollowing bbis bbtrue bbabout bbthe bbstudy bbwhose bbresults bbare bbsummarized
bbin bbTable bb1.1 bbof bbthe bbtextbook:
The bbstudy bbfinds bbaspirin bbprevents bbheart bbattacks
The bbstudy bbuses bba bbrandom bbsample bbrepresentative bbof bball bbmiddle-aged bband
bbolder bbadults
The bbstudy bbconcludes bbthat bbthere bbis bba bbplacebo bbeffect
All bbof bbthe bbabove bb- bbAnswerThe bbstudy bbfinds bbaspirin bbprevents bbheart bbattacks
Response bbFeedback:
See bbchapter bb1 bb"How bbto bbMove bbfrom bbNoticing bbto bbKnowing"
"Therefore, bbwe bbcan bbconclude bbthat bbtaking bbaspirin bbcaused bbthe bblower bbrate bbof
bbheart bbattacks bbfor bbthat bbgroup"
Which bbof bbthe bbfollowing bbwould bbgive bba bbnews bbreporter bbthe bbbest bband bbmost
bbcomprehensive bbfoundation bbfor bba bbnews bbstory bbinvolving bba bbstatistical bbstudy?
A bbpress bbrelease bbgives bbeverything bbthey bbneed bbbecause bbit's bbwritten bbjust bbfor
bbthem.
Another bbnewspaper bbarticle bbwritten bbby bba bbcompetitor.
A bbconference bbpresentation bbgiven bbby bbthe bbresearchers bbthemselves.
An bbarticle bbin bba bbpeer-reviewed bbscholarly bbjournal, bbaccompanied bbby bba bbpress
bbrelease. bb- bbAnswerAn bbarticle bbin bba bbpeer-reviewed bbscholarly bbjournal,
bbaccompanied bbby bba bbpress bbrelease.
What bbtype bbof bbsample bbwould bbgive bbthe bbmost bbunbiased bbdata?
A bbvolunteer bbsample.
A bbrandom bbsample.
A bbsample bbwith bba bbhigh bbnumber bbof bbrespondents.
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