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Quiz

STA 205 Quiz: ReviewEXAM4Exam


Department
Statistics
Course Code
STA 205
Professor
Brooke Buckley
Study Guide
Quiz

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12/17/2018 NKU Imath Assessment
https://imath.nku.edu/course/gb-viewasid.php?stu=11461&cid=335&asid=153998&uid=11461 1/7
Grade Book Detail
Damico , Emily
Exam 4 Review
Started: November 13, 2018, 1:29 pm
Last change: November 13, 2018, 2:39 pm
Time spent: 70 minutes
Total time questions were on‑screen: 60.6 minutes.
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12/17/2018 NKU Imath Assessment
https://imath.nku.edu/course/gb-viewasid.php?stu=11461&cid=335&asid=153998&uid=11461 2/7
 
EagleBoysisapizzachaininAustraliathatconductedanaggressiveadvertisingcampaign.Intheads,they
mademanyclaimsregardingthesizeoftheirlargepizzaswhencomparedtotheirleadingcompetitor.The
datafromwhichtheirclaimswerebasedwasmadepubliclyavailable.Onevariableofinterestwastheedge
toedgediameteroflargepizzas(measuredincentimeters).Thesampledataissummarizedinthe
StatCrunchoutputbelow:
a.Basedontheoutputgiven,wouldyouconcludethepizzadiametersarenormallydistributed?Explain
anddiscusswhetherthisisaconcern.
Thepizzadiameters  normallydistributedbecausetheqqplot
.Theassumptionstousethetdistributionforinference
 metbecause  .
b.Regardlessofyourdiscussioninparta,estimatetheaveragepizzadiameterwith95%confidence.
formula:
interval: + *
interpret:With95%confidence,weestimatethemeanpizzadiameterforEagleBoyspizzasto
fallbetween cmand cm.
c.EagleBoysmaincompetitorisDomino’s.ThemeandiameterofalargepizzaatDomino’swas
estimatedtofallbetween27.0239cmand27.8591cmwith95%confidence.Basedonthesetwo
intervals,istheirevidenceEagleBoy’shaslargerpizzas,onaverage?
Thereisnodifferenceinmeandiametersbecuasetheconfidenceintervalsforthetwochains
overlap.
EagleBoyshaslargerpizzas,onaverage,becuasethelowerlimitofitsintervalexceedsthe
lowerlimitforDomino's.
EagleBoyshaslargerpizzas,onaverage,becausethelowerlimitofitsintervalexceedsthe
upperlimitforDomino's.
EagleBoyshaslargerpizzas,onaverage,becuasetheupperlimitofitsintervalexceedsthe
upperlimitforDomino's.
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