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Suppose the superintendent of a large school district is interested in district-wide student satisfaction with the cafeteria food.

The superintendent decides to conduct a stratified sample by randomly selecting $30\text{ subjects}$ from each grade level, K-12, for a total of $390\text{ students}$ surveyed in the district.

What is the greatest benefit of conducting a stratified sample such as this one, compared to a simple random sample of $390\text{ students}$?


A stratified sample can contact more individuals to get more pieces of data and less variability.


A stratified sample can reduce bias.


A stratified sample can give more detailed information, showing food satisfaction for a variety of different ages.


Students are less likely to lie about their feelings regarding cafeteria food in this district if the sample is stratified.


In this situation, there are no benefits of a stratified sample compared to a simple random sample.

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