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An investigator who wishes to study the attitudes of people in Illinois identifies $1,000$ people in Illinois, taking care that the percentages of male and female, black and white, young and old are the same in the sample as in state's total population. What kind of sample is the investigator trying to obtain ?

1. an independent sample
2. a dependent sample
3. a random sample
4. a representative sample

1. a random sample
378 points
1. Representative Sample
by
26 points

1
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2
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