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# xyMar19Lec20 - The Analysis of Variance Chapter 9 Lecture...

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The Analysis of Variance Chapter 9 3/19/12 1 Lecture 19

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Reminders Last day a course be cancelled (with passing or failing grade) Last day, under extenua:ng circumstances, for course addi:ons, change of level or change of pass/not-pass op:on 3/19/12 Lecture 19 2
A little Review In Ch.8, we learned General test procedure how to test statements about: a population mean (One-Sample Mean test: one-sided, two-sided) Two population means (Two-Sample Mean test: one- sided, two-sided) Confidence Interval as basis for testing (two-sided C.I. for two-sided testing …) How about comparison of 3 or more population means? 3/19/12 Lecture 19 3

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Hypotheses. Some terminologies H 0 : µ 1 = µ 2 = … = µ k H a : At least one µ i is different If we reject the null hypothesis, the test does not say how or which ones differ Can follow up with “multiple comparisons”, to check which pairs differ We refer to the sub-populations as “groups” 3/19/12 4 Lecture 19

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xyMar19Lec20 - The Analysis of Variance Chapter 9 Lecture...

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