Question: What all statistic tests would need to be run for each scenario? It seems like this should be simple but I don't want to mess

What all statistic tests would need to be run for each scenario?

It seems like this should be simple but I don't want to mess it up. The charts below were given to start us off as guides but I received very little addition information.

Research study comparing cognition of placebo and supplemented groups, tested at baseline, 2 months, 4 months and 6 months.

Scenario A Medium effect size (0.5) power of 0.8 alpha level of 0.05 Total sample size of 118 participants; four groups of 29 participants per group

Scenario B Medium effect size (0.5) power of 0.8 alpha level of 0.05 Total sample size of 64 participants; two groups of 32 participants per group

Parametric tests (means) Nonparametric tests (medians)
1-sample t test 1-sample Sign, 1-sample Wilcoxon
2-sample t test Mann-Whitney test
One-Way ANOVA Kruskal-Wallis, Mood's median test
Factorial DOE with one factor and one blocking variable Friedman test

Parametric analyses Sample size guidelines for nonnormal data
1-sample t test Greater than 20
2-sample t test Each group should be greater than 15
One-Way ANOVA
  • If you have 2-9 groups, each group should be greater than 15.
  • If you have 10-12 groups, each group should be greater than 20.

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