Stratified sampling is a good technique to use when a subgroup of interest makes up a relatively small proportion of the overall sample.

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This statement is true. Stratified sampling allows for targeted sampling of specific subgroups within a larger population, which can be particularly useful when those subgroups are rare or represent a small proportion of the total population. By oversampling these subgroups, stratified sampling can ensure that their voices and experiences are adequately represented in the sample.

Stratified Sampling Is a Good Technique to Use When a Subgroup