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Final

STA 205 Lecture Notes - Lecture 8: Histogram, Box PlotExam


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

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12/17/2018 NKU Imath Assessment
https://imath.nku.edu/course/gb-viewasid.php?stu=11461&cid=335&asid=152137&uid=11461 1/9
Grade Book Detail
Damico , Emily
Topic 8: Sampling Distribution of the Sample Mean
Started: October 23, 2018, 7:26 pm
Last change: October 24, 2018, 1:23 pm
Total time questions were on‑screen: 213.3 minutes.
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12/17/2018 NKU Imath Assessment
https://imath.nku.edu/course/gb-viewasid.php?stu=11461&cid=335&asid=152137&uid=11461 2/9
NationalAirSystem
Carrier
Aircraft
Weather
Weather
Carrier
Aircraft
NationalAirSystem
ThisquestionrequiresyoutouseStatCrunch tocreateahistogramandboxplot.Eachpartofthe
questionthatrequiresStatCrunchincludesdirectionsforcreatingtheoutputinthesoftware.Firstyou
needtoopenthedatasetinStatCrunch:
IfyourinstructorhasaskedyoutojoinaStatCrunchGroup,openthedatasetFebruaryAirline
Delays.
Or,opentheattachedExcelfile andcopy(Ctl+A,Ctl+C)thedata.OpenanewStatCrunch
worksheet,clickintheboxwiththetextVar1,andpastethedata(Ctl+V).Beforeworkingthrough
thequestions,makesurethevariablenamesareinthetoprowoftheworksheet.
AsampleofflightsdepartingfromeitherCincinnatiorChicagoinFebruary2015wasselected.Forthose
flightswhichweredelayed,thelengthofthedelay(inminutes)wasrecorded.UseStatCrunchtocreatea
histogramofthevariableDelaylength(Graph>Histogram).Thencalculatesummarystatisticsforthe
variableDelaylength(Stat>SummaryStats>Columns).Usetheoutputtodescribethedistributionround
anynumericanswerto4decimalplaces.
Thedistributionofdelaylengthhasashapethatis .Themeandelaylengthwas
minutes,while50%ofthedelayedflightshadadelayof minutesormore.Theminimumdelay
lengthinoursampleof delayedflightswas minutes,whilethemaximumwas
minutes.Inthedistribution,themiddle %ofthedelayedflightshaddelaysbetween and72.5
minutes.Therearetwoflightswithdelaylengthsgreaterthan whichwouldlikelybeclassifiedas
unusualobservations.
Accordingto  Rule,weestimatethat ofdelayedflightswillhavea
delaylengthbetween and minutes(calculatetheintervalthatis3standarddeviationsfrom
themean).
Note:Bothlimitsofyourintervalshouldbelogicalvaluesinthedistributionbeingdescribed.
Nowcreatesidebysideboxplots(Graph>Boxplot)comparingthedelaylength(Selectcolumn:Delay
length)groupedbydelaycause.Checkmarktheboxto"drawboxeshorizontally."Usetheboxplotsto
answerthefollowing:
Whichdelaycausehadthesmallestmediandelaylength?
Whichdelaycausehadtheleastvariabilityindelaylength?
Whichdelaycauseswereresponsibleforthetwounusuallylargedelaysinthehistogram?Youshouldselect
tworesponses.

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12/17/2018 NKU Imath Assessment
https://imath.nku.edu/course/gb-viewasid.php?stu=11461&cid=335&asid=152137&uid=11461 3/9
Carrier
NationalAirSystem
Aircraft
Weather
Answer:rightskewed
Answer:61.9732
Answer:44.5
Answer:112
Answer:15
Answer:346
Answer:50
Answer:30
Answer:250
Answer:Chebyshev'sRule
Answer:90%ormore
Answer:0
Answer:219.0667
Answer:Weather
Answer:NationalAirSystem
Answer:
Carrier
Aircraft
Question 1: 10 (parts: 0.63, 0.63, 0.63, 0.63, 0.63, 0.63, 0.63, 0.63, 0.63, 0.63, 0.63, 0.63, 0.63, 0.63, 0.63,
0.55) out of 10 (parts: 0.63, 0.63, 0.63, 0.63, 0.63, 0.63, 0.63, 0.63, 0.63, 0.63, 0.63, 0.63, 0.63, 0.63, 0.63,
0.55)in 2 attempt(s)
Ifthesamplesizeincreases,whateffectwillthishaveonthemeanofthesamplingdistributionof ?
Themeanwilldecrease.
Themeanwillnotchange.
Themeanwillincrease.
Note:Youmayonlyattemptthisquestion2times.
Answer:Themeanwillnotchange.
Question 2: 2 out of 2 in 1 attempt(s)
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