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The survey is based on interviews conducted in 1,001 households across Berks County. Even with this large sample size you may encounter some problems with sample size, particularly when examining subgroups. We highly recommend that you never perform an analysis of the data on only a few ZIP codes.
If a sample size derived from your selected population group is somewhat small, it may not provide a strong basis for conclusions; you should definitely consider increasing the sample size in these cases by adding additional relevant ZIP Codes to your query. We recommend that when looking at smaller geographic areas that you interpret the data with caution.
Please feel free to contact us if you have any questions about this or want to know the exact sample size for a particular query. To reach us: click here
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