Inferences on Two Populations

# 61 2 15 57 483 test the alternative hypothesis that

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Unformatted text preview: n Sample Stdev 1 15 52 4.61 2 15 57 4.83 Test the alternative hypothesis that the mean lives G. Baker, Department of Statistics G. are different. University of South Carolina; Slide 10 How do we know if we can assume How equal variances? equal Confidence Interval on σ21/σ22 Hypothesis Test Hypothesis H0: σ21/σ22 = 1 Ha: σ21/σ22 = 1 G. Baker, Department of Statistics G. University of South Carolina; Slide 11 Test for Equal Variances Confidence Interval Approach: Confidence – If CI does not contain 1 we have If sufficient evidence to conclude that the variances are different. We can not assume equal variances. assume – If the CI contains 1, we will continue to If assume that the variances are equal. assume G. Baker, Department of Statistics G. University of South Carolina; Slide 12 Test for Equal Variances Hypothesis Test Approach: H0: σ21/σ22 = 1 Ha: σ21/σ22 = 1 If we reject H0, there is sufficient evidence to conclude that the variances are different. We can not assume equal variances. If we fail to reject H0, we will continu...
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## This note was uploaded on 01/12/2014 for the course STA 509 taught by Professor Wang during the Fall '13 term at South Carolina.

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