A stratified sample may require the calculation of ________ to achieve accuracy.
A)weighted mean
B)a mean
C)unweighted mean
D)weighted calculation

Question

Quizplus · Accepted Answer

A stratified sample involves dividing the population into subgroups and taking a sample from each subgroup. Each subgroup may have a different proportion of the population, and therefore a different weight in the overall calculations. In order to achieve accuracy in the analysis of the data, it is necessary to calculate a weighted mean, which takes into account the different weights of each subgroup. This is because different subgroups may have different levels of variability, and therefore contribute different amounts of information to the overall analysis. A weighted mean ensures that each subgroup is given the appropriate weight in the analysis, and is therefore the best choice for achieving accuracy in a stratified sample.

A Stratified Sample May Require the Calculation of ________ to Achieve