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Group 1: divided by house and pick one house to investigate. Also, we should investigate all of people in the house

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Group 1: divided by house and pick one house to investigate. Also, we should investigate all of people in the house

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Separate boys and girls into groups

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divide into genders.

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Divide people up into 2 groups based on their gender and survey the 2 groups

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divide basketball players from non basketball players

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divide into grade levels.

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Divide the High School students into two groups based on gender

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Divide each grade into a advisory class

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Survey a random house

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Survey advisory classes

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Stratified random sample because we can remove the people who are under 21 from the survey

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A stratified random sample would be better because there will be a big difference in alcohol use between people who are older than 21 and people who are not.

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stratified random sampling by male and female because cluster sampling might not be as accurate or detailed?

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Stratified random sample (dividing people younger than 21 years old and older than 21 years old) will be a better choice as there will be a dramatic difference in alcohol consumption between two age groups

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I would like to recommend a cluster sample because each state in U.S has a different population.

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Group 1: Stratified random sample by ages, because, by age, they might be situated in same circumstance such as job opportunities or academic ones, so the frequency of drinking something like that would be very similar. 

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Group 1: Stratified random sample by ages, because, by age, they might be situated in same circumstance such as job opportunities or academic ones, so the frequency of drinking something like that would be very similar. 

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Divide people who are 21 or above into 2 groups based on their gender and survey them

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Stratified random sample