The project will use two quantitative instruments to measure the seven independent variables and one dependent variable. We will use two groups. One is a control group that will not have any training. The research will include a pre-test of both groups. Then, a training session will take place. Finally, both groups will be re-tested again at a later date to see if the training made a difference. I am trying to figure out how many participants need to be included in each group.
Although the following paper is old, I think it would help you in this regard.
Statistical treatment of the Solomon four-group design: A meta-analytic approach.
MW Braver, SL Braver - Psychological bulletin, 1988 - psycnet.apa.org
Debra,
You may like to check this.
McCambridge, J., Butor-Bhavsar, K., Witton, J., & Elbourne, D. (2011). Can research assessments themselves cause bias in behaviour change trials? A systematic review of evidence from solomon 4-group studies. PloS one, 6(10), e25223. https://doi.org/10.1371/journal.pone.0025223
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