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Chapter 3: Q.45 (page 192)
Acid rain In the acid rain study of Exercise , the actual pH measurement for Week was. Find and interpret the residual for this week.
The residual for the week is
This line predicted a of that was too high for that week.
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The figure below is a scatterplot of reading test scores against IQ test scores for fifth-grade children. There is one low outlier in the plot. The IQ and reading scores for this child are
(a) , reading = .
(b) , reading = .
(c), reading = .
(d) , reading = .
(e) , reading = .
How much gas? Refer to Exercise . Would it be appropriate to use the regression line to predict Joan鈥檚 natural-gas consumption in a future month with an average temperature of 掳F? Justify your answer
Do heavier people burn more energy? Refer to Exercises and For the regression you performed earlier, and Explain what each of these values means in this setting.
Airlines have increasingly outsourced the maintenance of their planes to other companies. Critics say that the maintenance may be less carefully done so outsourcing creates a safety hazard. As evidence, they point to government data on the percent of major maintenance outsourced and the percent of flight delays blamed on the airline (often due to maintenance problems): Make a scatterplot by hand that shows how delays relate to outsourcing.
Strong association but no correlation The gas mileage of an automobile first increases and then decreases as the speed increases. Suppose that this relationship is very regular, as shown by the following data on speed (miles per hour) and mileage (miles per gallon). Make a scatterplot of mileage versus speed.
The correlation between speed and mileage is. Explain why the correlation is 0 even though there is a strong relationship between speed and mileage.
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