Chapter 11
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) Predict the weight of a student who is 64 inches tall, and give an RMS error for your
prediction.
b) Approximately what percentage of the students who are 64 inches tall will weigh
between 134 and 166 pounds?
c) Approximately what percentage of all students (regardless of height) will weigh
between 134 and 166 pounds?
2. a) Predict the height of a student who weighs 170 pounds, and give an RMS error for
your prediction.
b) Approximately what percentage of students who weigh 170 pounds will be between
63 and 73 inches tall?
c) Approximately what percentage of all students (regardless of weight) will be
between 63 and 73 inches tall?
3. a) Should the RMS error for weight change from Problem 1a) if the student is 70
inches tall?
b) Give the RMS error for height for a student weighing 140 pounds.
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 Spring '08
 Patton
 Statistics, Correlation, Mass, Imperial units, rms error, $2.10, $0.29

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