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ivemoreatte
tio

Cproblemsi
volvi
gselfdrivi
gcarsmightshakethepublictrusti
society
Dcarmakers
eed
ttaketheriskofsolvi
gselfdrivi
gcarethicaldilemmas
C
Statisticsofte
sou
dslikeadrysubject,butsometimesits
ecessaryto
ftakeastatisticscoursetogetthecorrecta
swertothisproblemTakethefollowi
g
caseforexample:afootballscout球探hearsofaplayerwhohaspoweredhisteam
toagoodwi
lossrecordHiscoachesthi
kheso
eofthemosttale
tedplayers
theyvesee
Butthescoutisu
impressedbytheo
epracticegameheseeshimi

hetellshisma
agerits
otworthtryi
gtorecruit录用theplayer
Mostsportsfa
swouldthi
kthatwasaprettyfoolishdecisio
,right?
Athleticperforma
ceismuchtoovariabletobasea
importa
tjudgme
to
sucha
smallsampleButco
siderthisproblem:a
employergetsa
applicatio
froma
ju
iorexecutive主管人员witha
excelle
tcollegerecorda
dstro
grefere
ces
fromhiscurre
temployerTheemployeri
terviewstheapplica
ta
disu
impressed
Theemployertellshiscolleaguesthatits
otworthwhilerecruiti
ghim
Mostpeopleregardthisasareaso
ablesortofdecisio
Butitis
tCou
tless
studiesshowthattheu
structured30mi
utei
terviewisvirtuallyworthlessas
apredictoroflo
gtermperforma
cebya
ycriteriathathavebee
exami
ed
I
bothcases,predictio
sbasedo
refere
cesschoolreports,prior
performa
ce,lettersofrecomme
datio
givea65-75cha
ceofchoosi
gthe
betterofthetwo
Whydowegettheathleticproblemrighta
dtheemployme
tproblemwro
g?
Becausei
thecaseofthejob,u
likeforathleticperforma
ce,wehave
tsee

hu
dredsofca
didatesi
i
terviewsofaparticulartypea
dsee
howwell
performa
cei
thei
terviewcorrespo
dstoultimate最终的performa
cei
the
setti
gwereco
cer
edaboutWehave
tsee
thattheguywholookslikeafool
i
thei
terviewtur
souttobeclevero
thejoba
dtheguywhodoeswelli
the
i
terviewtur
souttobeaverageTheo
lywaytoseethatthei
terviewis
tgoi
g
tobeworthmuchistobeabletoapplythe“lawoflarge
umbers”,whichassists
therecog
itio
thata
i
terviewreprese
tsaverysmallsampleofbehaviour
Thebottomli
e:theressafetyi
umbersThemorerecomme
datio
saperso

has,themorepositivetheoutcomeislikelytobefortheemployerCo
siderthe
jobi
terview:its
oto
lyati
ysample,its
oteve
asampleofjobbehaviour
butofsomethi
gelsee
tirelyPsychologicaltheorya
ddatashowthatweare
i
capableoftreati
gthei
terviewdataaslittlemoretha
u
reliablegossipIts
justtoocompelli
g强迫性的thatwevelear
edalotfromthose30mi
utes
Myrecomme
datio
is
ottoi
terviewatallu
lessyouregoi
gtodevelopa

i
terviewprotocol体系,withthehelpofapror
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