Problem

42. Two students were chosen at random from each first period class and asked to complete a survey about their sleep habits. What sampling method was used?

Answer

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Answer

Final Answer: The sampling method used is \(\boxed{\text{Stratified Sampling}}\)

Steps

Step 1 ：Two students were chosen at random from each first period class and asked to complete a survey about their sleep habits. The sampling method used is Stratified Sampling.

Step 2 ：Final Answer: The sampling method used is \(\boxed{\text{Stratified Sampling}}\)

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