Lectures 7, 8, and 9

(like separating out people by their age: 30s, 40s, 50s, 60s, etc. and choosing a separate sample from each age group) Similar to blocks in experiments. We could sort the students by their lecture section and take a SRS of 10 students from each of the 12 sections of STAT 301 to get a total sample size of 120. ................
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