How large would your population have to be for a sample to be appropriate?

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  You can use the G*Power program to get a better idea of how big your sample needs to be.

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  However, the time and money investment you would have to make to get a large enough sample size would not be very feasible.

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  In my case, my sample size is not large (16 < 30) and therefore, my effect may be smaller. I also expect the Power of my study to be less that it would be if I have a much larger sample.

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  The first of which is the use of electronic online databases as a way to administer large-scale surveys to reach the appropriate sample population. It is important to know that these data sources typically have a fee for using them.

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  You randomly sample 50 theaters in the United States. You ask those theaters how much they charge for a large popcorn, and you get a sample mean of $6.