Aresearcher conducts an experiment comparing two treatment conditions with 20 scores in each treatment condition.
a. if an independent-measures design is used, how many subjects are needed for the experiment

To determine the number of subjects that are needed for the experiments, we multiply the number of independent variables with the number of scores. For example, there are n independent variables then, there are approximately,

                                number of subjects = 20 x n = 20n

You can use a calculater and divide the minutes by the $$, hope that you