From the course: Learning Minitab (version Minitab 17)

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Compare multiple means using ANOVA

Compare multiple means using ANOVA - Minitab Tutorial

From the course: Learning Minitab (version Minitab 17)

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Compare multiple means using ANOVA

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- [Voiceover] In this movie, I will show you how to compare multiple means using ANOVA. Open exercise file 04-04. Here we have four office locations. A, B, C, D, with processing times, and we are interested in comparing the mean performance across these four offices. So we need to run ANOVA. Before we do that we have to test for normality and equal variances. Those are the two key assumptions in ANOVA. For normality test, go to Graph, Probability Plot, and the reason I chose this is because we have four groups, or four data sets. Choosing Multiple I can showcase all four on one graph. Okay, and there you have it. With the Anderson-Darling tests and the p-value shown, and the plots shown, and here we see with the high p-values, the data for each group is normal. To test for equal variances, go up to Stat, ANOVA, Test for Equal Variances. And our data are in separate columns, so let's choose that and highlight the four columns, and select OK. Here we have the confidence intervals shown,…

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