Define demographic measurement. Write its importance.​

they allow researchers to know how closely the sample resembles the target population. ... As such, researchers know the percentages of the population based on race, gender, age, education, and a whole host of other demographic characteristics.

Demographic measures typically are used to identify key respondent characteristics that might influence opinion and/or are correlated with behaviors and experiences. ... Demographic measures are also very important because they allow researchers to know how closely the sample resembles the target population

Explanation:

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this would and i think the answer is d