I need some help calculating a sample size. I have two groups of people to whom I need to fill out a questionnaire. Group A consists of 45,000 people and group B consists of 3,000 people. How do I know what is the right sample size for group A and group B? Thank you very much in advance!
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$\begingroup$ Hello Egn! It's quite impossible to say without knowing what you want to measure or compare, you need to provide much more information than that. $\endgroup$– J-J-JCommented May 30, 2023 at 15:34
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$\begingroup$ Thank you for your answer! It is a questionnaire on the use of a drug to be submitted to Italian and Albanian doctors. The Italian doctors total 45,000 while the doctors in Albania total 3000. Now I wonder, how many Italian doctors should I submit the questionnaire to and how many to Albanian doctors? Thank you very much. $\endgroup$– EgnCommented May 31, 2023 at 10:30
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$\begingroup$ If you want to compare if they answer differently to a yes/no question, the calculation for the required sample size may be different than if you need to compare, let's say, how many times they prescribe the drug during a given year. In short, we need more information about the variables you want to analyze - e.g. if they are categorical (if so, how many levels?), ordinal, continuous, etc., and the kind of statistical test you plan to use. $\endgroup$– J-J-JCommented May 31, 2023 at 10:52
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$\begingroup$ By the way, if you want you can edit your post to make all these information more visible, rather than giving them in the comment section. $\endgroup$– J-J-JCommented May 31, 2023 at 10:52
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$\begingroup$ Also, I assumed that you want to compare Italian to Albanian doctors, but if comparison is not your goal, you should mention what you are looking for. $\endgroup$– J-J-JCommented May 31, 2023 at 11:06
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