Inferences on Two Populations

61 2 15 57 483 test the alternative hypothesis that

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

Ask a homework question - tutors are online