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Inferences on Two Populations

# G bakerofdepartment of statistics university south

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Unformatted text preview: at 27.G.. Baker,ofDepartment of Statistics University South Carolina; Slide 7 Interpret the 95% confidence Interpret interval on µ1 - µ2 of (1.46, 8.54). (1.46, We have sufficient evidence to We conclude that there is a difference between the means. between B. We have insufficient evidence to We conclude that there is a difference between the means. between A. A. G. Baker, Department of Statistics G. University of South Carolina; Slide 8 Difference Between Means: µ1 – µ2 Difference Format for Test Statistic: Format Pt Est - Test Value Standard Error Test Statistic: Test Z= ( y1 − y2 ) − (µ1 − µ 2 )0 σ 12 n1 + 2 σ2 n2 t df = ( y1 − y2 ) − (µ1 − µ 2 )0 2 1 2 2 s s + n1 n2 G. Baker, Department of Statistics G. University of South Carolina; Slide 9 Two Samples from Independent Populations An independent consumer group tested radial tires from two major brands to determine whether there was any difference in the average tread life (thousands of miles). The summary data is below: summary Brand n Sample mea...
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