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Exam: 250714RR - Inferences and Linear Regression

This solved exam provides answers on inferential statistics and linear regression analysis.

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StudentID:22039100Exam:250714RR-InferencesandLinearRegressionWhenyouhavecompletedyourexamandreviewedyouranswers,clickSubmitExam.AnswerswillnotberecordeduntilyouhitSubmitExam.Ifyouneedtoexitbeforecompletingtheexam,clickCancelExam.Questions1to20:Selectthebestanswertoeachquestion.Notethataquestionanditsanswersmaybesplitacrossapagebreak,sobesurethatyouhaveseentheentirequestionandalltheanswersbeforechoosingananswer.1.In testing the difference between two population means using two independent samples, we usethepooled varianceinestimatingthestandard errorof thesampling distributionof thesample mean differencex̄1−x̄2iftheA.amplesizesarebothlarge.B.sizesarebothgreaterthan30.C.populationsarenonnormalwithunequalvariances.D.populationsareatleastnormallydistributedwithequalvariances.2.A left-tail area in the chi-square distribution equals 0.95. Fordf= 10, the table valueequalsA.15.987.B.20.483.C.3.940.D.18.307.3.In testing a population variance or constructing a confidence interval for the population variance, anessential assumption isthatA.the population is normallydistributed.B.expectedfrequenciesequalorexceed5.C.the population is uniformlydistributed.D.sample size exceeds30.4.A regression analysis between sales (in $1000) and advertising (in $) resulted in the following leastsquares line:yˆ= 80,000 + 5x.This implies that anincreaseofin advertising is expectedtoresultin anincreaseofinsales.A.$5,$5,000B.$1,$5C.$1,$80,005D.$1,$5,0005.With larger and larger numbers of categories in chi-square tests, the chi-square distribution takes ontheshapeofthedistribution.A.normalB.binomial

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