The primary difficulty encountered with stratified sampling is determining the basis for stratifying.

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Stratifying requires identifying a characteristic or variable that is related to the population's variability and dividing the population into homogeneous subgroups. Choosing the wrong basis for stratification could result in biased results. Therefore, determining the appropriate basis for stratification is a critical step in stratified sampling.

The Primary Difficulty Encountered with Stratified Sampling Is Determining the Basis