Quiz5 - the number of hours students be allowed to work Why...

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Name: Statistics and Probability (Math 80) Quiz #5 (Chapters 7 and 8) 1. On the axes below, sketch a scatterplot describing.. . a. a strong negative b. a strong association, association but r is near 0 c. a weak but positive positive association 2. 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
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Unformatted text preview: the number of hours students be allowed to work. Why might the school board's reasoning be faulty? (continued on back) 3. The following scatterplot shows the relationship between the distance and price of an airplane ticket on a particular airline. The regression line is given by the equation: 9 = 177.23 + 0.0786~ b 200 ' 600 1000 1400 1800 dist Mean St Dev Correlation a. Estimate the fare for a 200-mile flight. 1 b. Explain what the slope of the regression line means in this context. Distance 853.7 497.8 c. Explain what the y-intercept means in this context. Fare 244.33 56.37 0.694...
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