Chapter 10
For Problems 13, use the following information for students in a certain class.
Average weight: 150 pounds
SD for weight: 20 pounds
Average height: 68 inches
SD for height: 2.5 inches
Correlation (
r
): 0.6
1. a) Write the regression equation for weight on height (that is, the line that estimates
weight when height is given).
b) Use the equation to estimate the average weight of students who are 64 inches tall.
c) If we randomly select a student and find she is 64 inches tall, what weight should we
predict her to have?
2. a) Write the regression equation for height on weight (that is, the line that estimates
height when weight is given).
b) Use the equation to estimate the average height of students who weigh 170 pounds.
c) If we randomly select a student and find he weighs 170 pounds, what height should
we predict him to have?
3. a) Use the above information to sketch a rough scatter plot of height vs. weight.
Plot
the point of averages and sketch the SD line.
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 Spring '08
 Patton
 Statistics, Correlation, Forecasting, Regression Analysis, Mass, Imperial units, Percentile rank, Fuel efficiency

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