oompany has been rating television programskr more than 60 years. It uses severa

Question

oompany has been rating television programskr more than 60 years. It uses several samping procedures, but its main one is to track the viewing patterms of 20,000 households. These contain more than 45.000 eople and are chosen to form a cross section of the overal population. The households represent various locations, ethnic groups, and income brackets. The data gathered from the sample of 20.000 sed to draw inferenoes about the population of al households in the United States. Complete parts (a) and (b) below. What strata are used in the sample? Choose the correct answer below. A The television ratings O B. The number of households and people that are chosen O c. The various locations, ethnic groups, and income brackets that are represented O D. The various samping procedures and viewing pattems Why is it important to have a stratifed sample for these ratings? choose the comect answer below. o A stratsed sampling ensures that the television raings are aocurate. o B. straised samping ensures that only in the us aresampled. O c. stratified sampling ensures that each segment of the pon lation is represented. o D. Statsed samplng ensures ofee member on more groups used

Explanation / Answer

1. The strata used here C.

2. Also, stratified sampling ensures that each member of the population is represented well in our final sample. So correct answer is C

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