Question
I need to learn how to do a repeated measure ANOVA, but don'tunderstand what one shows. I need to compare three experimentalgroups (ie.placebo, treatment one and treatment two) in differenttests (e.g. maths test) before and after the drug. Im very confusedas to how to do this so any help is appreciated! I need to learn how to do a repeated measure ANOVA, but don'tunderstand what one shows. I need to compare three experimentalgroups (ie.placebo, treatment one and treatment two) in differenttests (e.g. maths test) before and after the drug. Im very confusedas to how to do this so any help is appreciated!
Explanation / Answer
ANOVA stands for analysis of variance between groups. Therefore, it is appropriate for comparing three experimentalgroups in different tests. <br> In an ANOVA test, we compare means to determine if thereexists a statistical significance of the difference in the samplemeans. We compare several means, and use a F statistic andits P-value to evaluate the null hypothesis. (Hypothesistesting) <br> For the hypothesis testing, the null hypothesis is set to allthe population means are the same. The alternatehypothesis is then not all means are equal (meaning that thereexists a statistical significance between at least 2 of thepopulation means. <br> Once we determine the F-statistic, if it is greater than Fcritical, we reject the null hypothesis and conclude that thereexists a statistical significance between at least 2 of thepopulation means. (Also, we can use the p-value, if theobserved is less than what we have (.05 is a common p-value), wereject the null and conclude that there is a statisticalsignificance.) <br> If the null hypothesis is not rejected, there does not existsignificant differences between the means (They are largely thesame).