A company has been rating television programs for more than

A company has been rating television programs for more than 60 years. It uses several sampling procedures, but its main one is to track the viewing patterns of 20,000 households. These contain more than 45,000 people and are chosen to form a cross section of the overall population. The households represent various locations, ethnic groups, and income brackets. The data gathered from the sample of 20,000 households are used to draw inferences about the population of all households in the United States. Complete parts (a) and (b) below. What strata are used in the sample? A. The various locations, ethnic groups, and income brackets that are represented B. The various sampling procedures and viewing patterns C. The television ratings D. The number of households and people that are chosen

Solution

A. The various locations, ethnic groups, and income brackets that are represented

is the right choice

Under stratified sampling people are divided into homogeneous strata or groups and sampling is taken from the groups at random.