Data 275 Homework Week 6

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University of California, Davis *

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275

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Statistics

Date

Apr 3, 2024

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docx

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3

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DATA275 02/17/2023 Homework Week 6 GGRAPH /GRAPHDATASET NAME="graphdataset" VARIABLES=AgeofBusyears AnnualMaintenanceCost$[name="AnnualMaintenanceCost_"] MISSING=LISTWISE REPORTMISSING=NO /GRAPHSPEC SOURCE=INLINE /FITLINE TOTAL=NO SUBGROUP=NO. BEGIN GPL SOURCE: s=userSource(id("graphdataset")) DATA: AgeofBusyears=col(source(s), name("AgeofBusyears")) DATA: AnnualMaintenanceCost_=col(source(s), name("AnnualMaintenanceCost_")) GUIDE: axis(dim(1), label("Age of Bus (years)")) GUIDE: axis(dim(2), label("Annual Maintenance Cost ($)")) GUIDE: text.title(label("Scatter Plot of Annual Maintenance Cost ($) by Age of Bus (years)")) ELEMENT: point(position(AgeofBusyears*AnnualMaintenanceCost_)) END GPL. CORRELATIONS /VARIABLES=AgeofBusyears AnnualMaintenanceCost$ /PRINT=TWOTAIL NOSIG FULL /MISSING=PAIRWISE. They have a positive linear correlation.
DATA275 02/17/2023 R² Linear = 0.873 REGRESSION /MISSING LISTWISE /STATISTICS COEFF OUTS R ANOVA /CRITERIA=PIN(.05) POUT(.10) /NOORIGIN /DEPENDENT AnnualMaintenanceCost$ /METHOD=ENTER AgeofBusyears. Y=220+131.667*X The slope is smaller than .5. The coefficient is valued. Every year the bus gets older; the maintenance cost should increase by $132 rounding up. =220+131.667*4.5 812.5015, or rounding up the annual maintenance for a bus that is four and half years cold can be $813.
DATA275 02/17/2023 Reference Elliott, A.C. & Woodward, W. A. (2020)   Quick guide to IBM SPSS; Statistical analysis with step-by-step examples   (3 rd   ed). Los Angeles: SAGE
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