My son is in the fifth grade and has come up with the idea of having participants of different age groups (school age children, middle-age adults, and senior citizens) play Tetris for 10-15 minuter per day 4x per week. Before the participants play tetris they would take a memory test using a tool provided by AARP: http://braingames1.aarp.org/shapes_and_colors.html
. He is going to have a control group in which the participants only take the memory test and then the experiemental group. Both groups would take the test at the end of each of the four weeks. His hypothesis is that playing Tetris will increase memory in all participants. He has a couple of questions regarding this plan design:
1.) Does his control group and experimental group have to have the same number of participants? For example, for school age children, if two are in the experimental group, would it be ok if he has only one in the control group?
2.) Does he need to have the same number of participants in each of the different age groups? For example, he may have 2-3 school age children participate and 5-6 senior citizens participate.
3.) Due to the time and number of available participants, being able to reproduce the test will be challenging? Does each participant represent a seperate "test"?
4.) The game through AARP asks participants to identify their age, gender, and level of education. I believe they collect this information to capture demogrpahics for comparision purposes. When one finishes the exam they are able to how they rank against others. I dont believe it changes the actual game itself. If we instruct all participants to use the same data information (set age, school, gender) would that work?
Thanks so much.