Please make sure that it is your own work and not copy and paste off of some one else work because the professor will check. This is a DBA course and needs to be done on this level. Please watch out for spelling and grammar errors. Please use the APA 7th format edition. Please read the study guide.
Book reference: Gliner, J. A., Morgan, G. A., Leech, N. L. (2017). Research methods in applied settings: An integrated approach to design and analysis (3rd ed.)Routledgehttps://online.vitalsource.com/#/books/9781317526896
A junior doctoral student approaches you for advice about their proposed research design. They want to measure differences in personality based on four different age groups. Regarding within-group and between-subjects, what other variables should the junior doctoral student consider?