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A STAT 200 instructor is interested in the average weekly study time for STAT 200 students....

A STAT 200 instructor is interested in the average weekly study time for STAT 200 students. She teaches three sections, and separates the classes by gender and then randomly selected students from those two groups. a. What is this sampling method? Cluster, convenience, stratified, or systematic? b. Why?

math   Statistics-And-Probability   
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Here we will use stratified sampling as we divide the data in homogeneous groups known as strata and then choosing from them the samples that's why it is stratified sampling

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