![]() ![]() Press Ctrl-m and double-click on the Analysis of Variance option. To do this we use the Analysis of Variance data analysis tool found in the Real Statistics Resource Pack. ![]() Example using Excel formatĮxample 1: Find the confidence intervals for each of the methods in Example 3 of Basic Concepts for ANOVA. We could have used as the estimate of the variance for the jth group in the calculation of the standard error, but since it is assumed that the variances of all the groups are equal, MS W is an estimate of group j based on a larger sample than, and so by the Law of Large Numbers, MS Wprovides a better estimate of the jth group variance than. As described in One Sample Hypothesis Testing, the confidence interval is given byĮstimated mean ± critical value ∙ std errorĪlternatively, by Property 1 of F Distribution, we can use the following as the critical value
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