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2 weeks ago
A school board study found a moderately strong negative association between the number of hours high school seniors worked at part-time jobs after school hours and the students' grade point averages.

a. Explain in this context what "negative association" means.
b. Hoping to improve student performance, the school board passed a resolution urging parents to limit the number of hours students be allowed to work. Do you agree or disagree with the school board's reasoning?  Explain.
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Stats: Modeling the World


Edition: 4th
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2 weeks ago
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a.  Students who worked more hours tended to have lower grades.
b.  They are mistakenly attributing the association to cause and effect. Maybe students with low grades are more likely to seek jobs, or maybe there is some other factor in their home life that leads both to lower grades and to the desire or need to work.
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