Question: Effective SAT prep? Suppose an SAT preparation course makes the following statement in their advertising brochure: We asked our graduates to report on their SAT

Effective SAT prep? Suppose an SAT preparation course makes the following statement in their advertising brochure: "We asked our graduates to report on their SAT scores before and after taking our course. The mean increase in SAT scores for 500 graduates who responded was 210 points." Describe how nonresponse might lead to bias in this study. Is the mean of 210 points likely greater than or less than the actual mean increase for all graduates of the course?

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