My data is about prepaid Telecom users so you will find variables like the quantity of data used, ARPU, the lifetime of the user... My sample's size is : 237707 users My target population's size is : 1200803 users I drew the sample using proc surveyselect with the method SRS. I ran the khi2 test on my qualitative variables and TTEST on my quantitative variables and my results were significant. But when I compared the mean of the ARPU of my sample to the mean of the ARPU of my target population I found that they were significatly different. That's why my sample isn't representative. I can't redo a sampling on my whole population because some action was performed on my target population. That's why the only change I can do is on the sample. I don't think that I have the last problem since they all come from the same population. Thank you for your response.
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