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Lecture

# ADMS 3330 Lecture Notes - Analysis Of Variance, Coefficient Of Determination

Department
Course Code
Professor
Thabit Abdullah

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Due:Monday,May28(SectionD)
Tuesday,May29(SectionsBandE)
Wednesday,May30(SectionC)
Notes:1.Questionsmustbedonemanually.YouarenotallowedtopresentExceloutputasasolution,
howeverExceluseisrecommendedtocheckifyourcalculationsarecorrect.
2.Theassignmentsmustbetypedandtobehandedinyourregisteredsection.
3.Allassignmentsmaybedoneindividuallyoringroupsofuptofour.Refertothecourseoutlinefor
furtherinformation.
Question1(50points,KellerCh16):
Thefollowinginformationwasobtainedfromthemanagerofapowerdepartmentforpredictingthe
consumptionofpower(inunits)fromthesizeofhouseholds:
Household
Size(x)
Power
Used(y)
3650
71200
81300
2430
101400
6900
91300
3640
3793
4925
Youarehelpingthemanagertoestimatepowerconsumptionasalinerfunctionofhouseholdsizeusing
leastsquaresmethod.
a) Determinetheleastsquaresregressionline.(Treatthehouseholdsizeasanintervalvariable).
b) Assumingthatthediagnosticschecksdonotindicateaviolationoftherequiredconditions,interpret
thevalueoftheslopeoftheregressionline.
variables.
d) Predictwith95%confidencethepowerconsumptionofahouseholdwithasizeof5.
e) Atthe5%significancelevel,isthereenoughevidenceofalinearrelationshipbetweenpower
consumptionandthehouseholdsize?Presentthecorrecthypothesis,calculatethenecessary
statistics,andconcludethehypothesistesting.