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What type of sampling method has mr. roberts used

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Mr. Roberts is conducting a study of the television viewing habits of people in Chicago, IL. To ensure that he will be able to compare viewing habits across ethnic groups, he randomly samples 50 Caucasian households, 50 African-American households, 50 Hispanic households and 50 Asian households. What type of sampling method has Mr. Roberts used?

Stratified random sampling

Snowball sampling

Cluster sampling

Simple random sampling

Reference no: EM131084657

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