Use the data in Exercise 25 of Section 7.1. a. Construct a scatterplot and, based on visual

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Use the data in Exercise 25 of Section 7.1.

a. Construct a scatterplot and, based on visual inspection, draw the best-fit line by eye.

b. Briefly discuss the strength of the correlation. Estimate or compute r and r2. Based on your value for r2, identify how much of the variation in the variable can be accounted for by the best-fit line.

c. Identify any outliers on the scatterplot and discuss their effects on the strength of the correlation and on the best-fit line.

d. For this case, do you believe that the best-fit line gives reliable predictions outside the range of the data on the scatterplot? Explain.

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Statistical Reasoning for Everyday Life

ISBN: 978-0321817624

4th edition

Authors: Jeff Bennett, Bill Briggs, Mario F. Triola

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