Statistical Inference and Hypothesis Testing: Analysis of Population Means and Variances

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Statistical Inference and Hypothesis Testing: Analysis of Population Means and VariancesTop of FormQuiz 5 MATH302Return to Assessment ListPart 1 of 8-2.0/ 3.0 PointsQuestion 1 of 171.0/ 1.0 PointsTwo independent samples ofsizes n1 = 50 and n2 =50 are randomly selected from two populations totest the difference between the population means,. The sampling distribution of thesample mean difference,is:A.approximately normalB.chi-squareddistributed with 99 degrees of freedomC.t-distributed with 98 degrees of freedomD.normally distributedAnswer Key: AQuestion 2 of 171.0/ 1.0 PointsWhich of the following statements is true regarding the F–distribution?

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A.It is a distribution of negative valuesB.It is always skewed to the leftC.Ittypically appears in tests of equal proportionsD.none of the aboveAnswer Key: DQuestion 3 of 170.0/ 1.0 PointsSerum ferritin is used in diagnosing iron deficiency.In a study conducted recently researchersdiscovered that in a sample of 28 elderly men the sample standard deviation of serum ferritin was 52.6mg/L.For 26 younger men the sample standard deviation was 84.2 mg/L.At the .01 level ofsignificance, do these data support the conclusion that the ferritin distribution in elderly men has asmaller variance than in younger men?A.Yes, because the test value 2.56 is greater than the critical value0.394B.Yes, because the test value 0.390 is less than the critical value 2.54C.No, because the test value 1.60 is less than the critical value of 2.54D.Yes, because the test value 2.56 is greater than the critical value of 2.54Answer Key: DPart 2 of 8-4.0/ 5.0 PointsQuestion 4 of 171.0/ 1.0 Points

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Data for a sample of 25 apartments in a particular neighborhood are provided in the worksheetApartments in the Excel workbook Apartments.xlsx.Using that data, findthe estimated regressionequation which can be used to estimate the monthly rent for apartments in this neighborhood usingsize as the predictor variable.Apartments.xlsxA.177.12 + 0.8500(size)B.177.12 + 1.065(size)C.1.065 +177.12(size)D.197.12 + 2.065(size)Answer Key: BQuestion 5 of 171.0/ 1.0 PointsThe correlation value ranges fromA.–2 to +2B.–1 to +1C.0 to +1D.-3 to +3Answer Key: BQuestion 6 of 170.0/ 1.0 PointsAnagent for a residential real estate company in a large city would like to be able to predict themonthly rental cost of apartments based on the size of the apartment.Data for a sample of 25

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