What is the defining Characteristic of a repeated-measures or within-subjects re

Question

What is the defining Characteristic of a repeated-measures or within-subjects research design? Explain the difference between a matched-subjects design and a repeated-measures design. A researcher conducts an experiment comparing two treatment conditions with 20 scores in each treatment condition. If an independent-measures design is used, how many subjects are needs for the experiment? If a repeated-measures design is used, how many subjects are needed for the experiment? If a matched-subjects design is used, how many subjects are needed for the experiment? A sample of n = 9 individuals participates in a repeated-measures study that produces a sample mean difference of M_D = 4.25 with SS = 128 for the difference scores

Explanation / Answer

4.) (a) The independent-measure design would require 40 subjects. (two seperate samples with n=20 in each)

(b) the repeated-measure design would require 20 subjects (the same 20 individuals are measured in both treatments)

(c) the matched-subjects design would require   40 subjects (20 matched pair).

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