STATS 202 FINAL EXAM WITH
CORRECT QUESTIONS AND
ANSWERS
a6_______6describes6an6individual6by6placing6the6individual6into6a6category6or6group,6s
uch6as6male6or6female6-6answer-qualitative6variable
a6_____6is6a6quantitative6variable6that6has6either6a6finite6number6of6possible6values6or6
a6countable6number6of6possible6values6-6answer-discrete6variable
a6_____6is6a6quantitative6variable6that6has6an6infinite6number6of6possible6values6that6ar
e6not6countable6-6answer-continuous6variable
a6_____6is6an6explanatory6variable6that6was6not6considered6in6study,6but6that6affect6the
6value6of6the6response6variable6in6the6study6-6answer-lurking6variable
a6____6is6one6obtained6by6separating6the6population6into6homogeneous,6non-
overlapping6groups6called6strata,6and6then6obtaining6a6simple6random6sample6from6eac
h6stratum6-6answer-stratified6sample
a6_____6is6obtained6by6selecting6every6kth6individual6from6the6population6-6answer-
systematic6sample
a6____6experiment6is6one6in6which6the6experimental6unit6(or6subject)6does6not6know6wh
ich6treatment6he6or6she6is6receiving6-6answer-single-blind
a6_____6experiment6is6one6in6which6neither6the6experimental6unit6nor6the6researcher6in
6contact6with6the6experimental6unit6knows6which6treatment6the6experimental6unit6is6rece
iving6-6answer-double-blind
, the6highest6frequency6occurs6in6the6middle6and6frequencies6tail6off6to6the6left6and6right6
of6the6middle6is6called6-6answer-bell-shaped6distribution
if6the6tail6to6the6left6of6the6peak6is6longer6than6the6tail6to6the6right6of6the6peak6then6the6d
ata6is6considered6-6answer-skewed6left
the6bank6account6numbers6of6the6students6in6a6class
a.6qualitative6
b.6quantitative6-6answer-a.6qualitative
the6weights6of6cases6loaded6onto6an6airport6conveyor6belt6
a.6qualitative6
b.6quantitative6-6answer-b.6quantitative
the6number6of6bottles6of6juice6sold6in6a6cafeteria6during6lunch6
a.6discrete6
b.6continuous6-6answer-a.6discrete
the6weight6of6a6player6on6the6wrestling6team6
a.6discrete6
b.6continuous6-6answer-b.6continuous
the6personnel6director6at6a6large6company6would6determine6whether6the6company6cafet
eria6is6widely6used6by6employees.6she6calls6each6employee6and6asks6them6whether6th
ey6usually6bring6their6own6lunch,6eat6at6the6company6cafeteria,6or6go6out6for6lunch6
a.6observational6study6
b.6experiment6-6answer-a.6observational6study
a6scientist6was6studying6the6effects6of6a6new6fertilizer6on6crop6yield.6she6randomly6assi
gned6half6of6the6plots6on6a6farm6to6group6one6and6the6remaining6plots6to6group6two.6on6
the6plots6in6group6one,6the6new6fertilizer6was6used6for6a6year.6on6the6plots6in6group6two
,6the6old6fertilizer6was6used.6at6the6end6of6the6year,6the6average6crop6yield6for6the6plots6
in6group6one6was6compared6with6average6crop6yield6for6the6plots6in6group6two6
a.6observational6study6
b.6experiment6-6answer-b.6experiment
every6fifth6adult6entering6an6airport6is6checked6for6extra6security6screening.6what6sampli
ng6technique6is6used?6
a.6systematic6
b.6simple6random6
c.6cluster6
d.6convenience6
e.6stratified6-6answer-a.6systematic
at6a6local6technical6school,6five6auto6repair6classes6are6randomly6selected6and6all6of6th
e6students6from6each6class6are6interviewed.6what6sampling6technique6is6used?6
CORRECT QUESTIONS AND
ANSWERS
a6_______6describes6an6individual6by6placing6the6individual6into6a6category6or6group,6s
uch6as6male6or6female6-6answer-qualitative6variable
a6_____6is6a6quantitative6variable6that6has6either6a6finite6number6of6possible6values6or6
a6countable6number6of6possible6values6-6answer-discrete6variable
a6_____6is6a6quantitative6variable6that6has6an6infinite6number6of6possible6values6that6ar
e6not6countable6-6answer-continuous6variable
a6_____6is6an6explanatory6variable6that6was6not6considered6in6study,6but6that6affect6the
6value6of6the6response6variable6in6the6study6-6answer-lurking6variable
a6____6is6one6obtained6by6separating6the6population6into6homogeneous,6non-
overlapping6groups6called6strata,6and6then6obtaining6a6simple6random6sample6from6eac
h6stratum6-6answer-stratified6sample
a6_____6is6obtained6by6selecting6every6kth6individual6from6the6population6-6answer-
systematic6sample
a6____6experiment6is6one6in6which6the6experimental6unit6(or6subject)6does6not6know6wh
ich6treatment6he6or6she6is6receiving6-6answer-single-blind
a6_____6experiment6is6one6in6which6neither6the6experimental6unit6nor6the6researcher6in
6contact6with6the6experimental6unit6knows6which6treatment6the6experimental6unit6is6rece
iving6-6answer-double-blind
, the6highest6frequency6occurs6in6the6middle6and6frequencies6tail6off6to6the6left6and6right6
of6the6middle6is6called6-6answer-bell-shaped6distribution
if6the6tail6to6the6left6of6the6peak6is6longer6than6the6tail6to6the6right6of6the6peak6then6the6d
ata6is6considered6-6answer-skewed6left
the6bank6account6numbers6of6the6students6in6a6class
a.6qualitative6
b.6quantitative6-6answer-a.6qualitative
the6weights6of6cases6loaded6onto6an6airport6conveyor6belt6
a.6qualitative6
b.6quantitative6-6answer-b.6quantitative
the6number6of6bottles6of6juice6sold6in6a6cafeteria6during6lunch6
a.6discrete6
b.6continuous6-6answer-a.6discrete
the6weight6of6a6player6on6the6wrestling6team6
a.6discrete6
b.6continuous6-6answer-b.6continuous
the6personnel6director6at6a6large6company6would6determine6whether6the6company6cafet
eria6is6widely6used6by6employees.6she6calls6each6employee6and6asks6them6whether6th
ey6usually6bring6their6own6lunch,6eat6at6the6company6cafeteria,6or6go6out6for6lunch6
a.6observational6study6
b.6experiment6-6answer-a.6observational6study
a6scientist6was6studying6the6effects6of6a6new6fertilizer6on6crop6yield.6she6randomly6assi
gned6half6of6the6plots6on6a6farm6to6group6one6and6the6remaining6plots6to6group6two.6on6
the6plots6in6group6one,6the6new6fertilizer6was6used6for6a6year.6on6the6plots6in6group6two
,6the6old6fertilizer6was6used.6at6the6end6of6the6year,6the6average6crop6yield6for6the6plots6
in6group6one6was6compared6with6average6crop6yield6for6the6plots6in6group6two6
a.6observational6study6
b.6experiment6-6answer-b.6experiment
every6fifth6adult6entering6an6airport6is6checked6for6extra6security6screening.6what6sampli
ng6technique6is6used?6
a.6systematic6
b.6simple6random6
c.6cluster6
d.6convenience6
e.6stratified6-6answer-a.6systematic
at6a6local6technical6school,6five6auto6repair6classes6are6randomly6selected6and6all6of6th
e6students6from6each6class6are6interviewed.6what6sampling6technique6is6used?6