One goal of stratified sampling plans is to decrease the amount of variability in each stratum. This can be accomplished by
A) making the strata internally heterogeneous.
B) increasing the amount of sampling error.
C) decreasing the magnitude of the overall sample mean.
D) making the strata internally homogeneous.
E) using a 99% confidence level instead of a 95% confidence level.

Question

Quizplus · Accepted Answer

Stratified sampling aims to reduce variability within each stratum by making them internally homogeneous, ensuring that each stratum is more similar internally, which reduces variability and improves the precision of the overall estimate.

One Goal of Stratified Sampling Plans Is to Decrease the Amount