Experimental Design

Question 1

ANOVA vs. ANCOVA

Answer 1

Analysis of variance is used to assess the difference in group means for a continous outcome variable

Analysis of co-variacne is used to assess the difference in group means for a continuous outcome variaable with at least one categorical predictor and one continuous predictor

ANCOVA is equivalent to regression

Question 2

What does statistical power refer to?

Answer 2

probability of a hypothesis test finding an effect if there is an effect to be found.

A power analysis can be used to estimate the minimum sample size required for an experiment, given a desired significance level, effect size, and statistical power.

Question 3

How is an effect size typically calculated for a 2 condition experiment?

Answer 3

Take the difference between the means of each group and divide by the standard deviation.