04-anova-part2-handout

04-anova-part2-handout - STA 3024: ANOVA Douglas Whitaker...

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Unformatted text preview: STA 3024: ANOVA Douglas Whitaker Statistics Department 10 February 2012 Douglas Whitaker (Statistics Department) STA 3024: ANOVA 10 February 2012 1 / 8 Analysis of Variance In an experiment to investigate the effect of color of paper (blue, green, orange) on response rates for questionnaires distributed by the windshield method in supermarket parking lots, 15 representative supermarket parking lots were chosen in a metropolitan area and each color was assigned at random to five of the lots. The response rates (in percent) follow. Blue 28 26 31 27 35 Green 34 29 25 31 29 Orange 31 25 27 29 28 Douglas Whitaker (Statistics Department) STA 3024: ANOVA 10 February 2012 2 / 8 Confidence Intervals Remember that confidence intervals are of the form estimator (confidence number)(standard error) . What were going to do is form confidence intervals for the pairs of differences between all of the groups. This is going to be okay because well only form these intervals after rejecting the the null hypothesis of no differences using ANOVA....
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04-anova-part2-handout - STA 3024: ANOVA Douglas Whitaker...

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