What is the maximum number of population in quasi experimental research design using pre/post and control in a study?
It depend on your objectives i.e what the variables your looking for
There is no maximum. Having more participants will increase your "statistical power," i.e., the ability to find small but significant effects.
Thanks for your professional advice and insights
The more samples you get the better for inference
There is no limitation in number. Instead, the high number of participants will contribute to the generalizability of your finding(s) beside other factors...
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