A researcher wishes to measure income across different age groups of consumers. The researcher wants to ensure that every age group under consideration is represented in the sample. The researcher probably will use a .

Stratified random sample

Explanation:

Stratified random sample -

It is also known as quota random sampling and proportional random sampling  .

It refers to the process of sampling , where the complete data or population is distributed into smaller sub - groups , known as the strata .

The distribution of the strata is done on the basis of certain factors like age , gender , education qualification , etc. , there by making the sampling process easier .

Hence , from the given information of the question ,

The correct answer is stratified random sampling .

answer; comparing the additional benefits and costs;