Can someone help me to answer in my research homework

#1
I am studying a basic research course and making an assumed research project. The sample size I used is 120 people calculated by using a conservative ratio of ten observations for each independent variable through multiple regression analysis. I have 12 independent variables.

However, my teacher asks me "How many sets of questionnaire will be distributed if I need to have a minimum required sample size of 120?" I am not sure if there is some formula should be used.

For more information, I use convenience sampling technique and there are 3 places to distribute the questionnaire. Can someone please help me to answer the above question. Thank you very much.
 

hlsmith

Omega Contributor
#3
Do you know anything about the population you are sampling that would affect their response rate? Typically in research you solicit at least 10% more than you need to address non-respondents and loss-to-follow-up, but you need to take your personal population into consideration and their incentives for completion. Is there information that you are not providing?