1. A researcher conducts an experiment comparing three treatment conditions. The data consist of n=20 scores for each treatment condition.
a. If the researcher used an independent-measures design, then how many individuals were needed for the study and what are the df values for the F ratio?
b. If the researcher used a repeated-measures design, then how many individuals were needed for the study and what are the df values for the F ratio?
OK, so you have three treatments: A, B, and C.
Each of those treatments needs 20 scores.
If you're doing an independent measures design, that means you have different people in each condition, so you would need 3(treatments)x20(scores)=60 people.
If you're doing a repeated measures design, assuming that each person is is completing each of the three treatments, you only ...
This solution contains instructions to compare the independent variables in three treatment conditions.