If the population is believed to have a skewed distribution for one or more of its distinguishing factors (e.g. income or product usage) - the researcher identifies subpopulations in the sample frame called strata. A simple random sample is then tak

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1. If the population is believed to have a skewed distribution for one or more of its distinguishing factors (e.g. income or product usage) - the researcher identifies subpopulations in the sample frame called strata. A simple random sample is then tak