C784 STATISTICS FULL COURSE REVIEW QUESTIONS WITH CORRECT ANSWERS 2026

C784 STATISTICS FULL COURSE REVIEW
ty ty ty ty



QUESTIONS WITH CORRECT ANSWERS 2025
ty ty ty ty


Lurking tyVariable ty- tyCORRECT tyANSWER ty-
Associated tywith tythe tyexplanatory tyand tythe tyresponse tyvariables tythat tyis tynot tydirectly tybeing tystudied.



Simpson's tyParadox ty- tyCORRECT tyANSWER ty-
OccursRwhen tya tytrend tyor tyresult tythat tyappears tyin tygroups tyof tydata tydisappears tywhen tywe tycombine tythe
tydata.




Regression tyAnalysis ty- tyCORRECT tyANSWER ty-
A typrocess tyfor tyestimating tyand tyanalyzing tythe tyrelationship tybetween tyvariables.



Least-Squares tyRegression tyLine ty- tyCORRECT tyANSWER ty-AKA tythe tyline tyof

best tyfit. tyy ty= tymxR+ tyb
ty



"rise tyover tyrun"



Interpolation ty- tyCORRECT tyANSWER ty-Using tyexisting tydata tyalong tywith tythe
tyLeast- tySquares tyRegression tyLine tyto tymake tya typrediction.




Extrapolation ty- tyCORRECT tyANSWERR-Estimation tyby typrojecting tyOUTSIDE tyknown tydata typoints.



p-value ty- tyCORRECT tyANSWER ty-the typrobability tythat tya tyresult tyoccurred tyby tychance



Significance tyLevels tyin tyHypothesis tyTesting ty- tyCORRECT tyANSWER ty-Statistically tySignificant: tyIf tya
tymeasured typ- tyvalue tyis tyless tythan tythe tysignificance tylevel.




NOT tyStatistically tySignificant: tyIf tya tymeasured typ-value tyis tyMORE tythan tythe tysignificance tylevel.



Empirical tyRule ty- tyCORRECT tyANSWER ty-68 ty- ty95 ty- ty99.7



68% tyis tyw/in ty1 tystandard tydeviation tyof tythe tymean

, 95% tyis tyw/in ty1 tystandard tydeviation tyof tythe tymean



99.7% tyis tyw/in ty1 tystandard tydeviation tyof tythe tymean



Used tyfor tyCategorical ty(Qual) tyData ty- tyCORRECT tyANSWER ty-Bar

Chart tyPie tyChart
ty




Mean ty- tyCORRECT tyANSWER ty-Average ty- tyadding tyseries tythen tydividing tyby tythe tytotal tynumber tyin tythat
tyseries




Center ty& tySpread tyMeasures ty- tyCORRECT tyANSWER ty-SYMMETRIC
ty- tyMean ty(center) ty/ tyStandard tyDeviation ty(spread)




SKEWED ty- tyMedian ty(center) ty/ tyIQR ty(spread)



CATEGORICAL ty- tyMode ty(center) ty/ tyno tyspread



What tyis tythe tydifference tybetween tya tybar tychart tyand tya tyhistogram? ty- tyCORRECT tyANSWER ty-BAR tyCHART ty-
tyCategorical tydata tydistributed tyover tygroups tyof tycategories




HISTOGRAM ty- tyQuantitative tydata tydistributed tyover tyvarious tyintervals



Outlier tyFormula ty- tyCORRECT tyANSWER ty-1.5 tyx tyIQR tyabove tyQ3 tyor tybelow tyQ1



Graphical tyDisplays tyfor tyQuantitative tyVariables ty- tyCORRECT tyANSWER ty-HISTOGRAMS ty- tylarge tydata

sets tySTEM tyPLOTS ty- tykeeps tyindividual tydata typoints
ty



DOT tyPLOTS ty- tysmaller tydata tysets

BOX tyPLOTS ty- tycenter, tyspread tyand ty5 tynumber tysummary

ty SCATTER tyPLOTS ty- tyx,y tyaxis