Sampling is ordinarily used to select observations for one of two related reasons. First, it is often not possible to collect information from all persons or other units we wish to study. For example, we may wish to know what proportion of all persons arrested in U.S. cities have recently used drugs, but collecting all that data would be virtually impossible. Thus, we select a _____.

Question

Quizplus · Accepted Answer

A. This is an incorrect answer because since it is often not possible to collect information from all persons or other units we wish to study, we opt to select a representative sample. For example, we may wish to know what proportion of all persons arrested in U.S. cities have recently used drugs, but collecting all that data would be virtually impossible. So we carefully select a sample that represents population.
B. This is an incorrect answer because since it is often not possible to collect information from all persons or other units we wish to study, we opt to select a representative sample. For example, we may wish to know what proportion of all persons arrested in U.S. cities have recently used drugs, but collecting all that data would be virtually impossible. So we carefully select a sample that represents population.
C. This is an incorrect answer because since it is often not possible to collect information from all persons or other units we wish to study, we opt to select a representative sample. For example, we may wish to know what proportion of all persons arrested in U.S. cities have recently used drugs, but collecting all that data would be virtually impossible. So we carefully select a sample that represents population.
D. The correct answer is "D" because since it is often not possible to collect information from all persons or other units we wish to study, we opt to select a representative sample. For example, we may wish to know what proportion of all persons arrested in U.S. cities have recently used drugs, but collecting all that data would be virtually impossible. So we carefully select a sample that represents population.

Sampling Is Ordinarily Used to Select Observations for One of Two