Motorcycles. More than one million motorcycles are sold annually (www.webbikeworld.com). Off-road motorcycles (often called dirt bikes) are

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Motorcycles. More than one million motorcycles are sold annually (www.webbikeworld.com). Off-road motorcycles

(often called “dirt bikes”) are a market segment

(about 18%) that is highly specialized and offers great variation in features. This makes it a good segment to study to learn about which features account for the cost (manufacturer’s suggested retail price, MSRP) of a dirt bike.

Researchers collected data on 2005 model dirt bikes

(lib.stat.cmu.edu/datasets/dirtbike_aug.csv). Their original goal was to study market differentiation among brands (The Dirt on Bikes: An Illustration of CART Models for Brand Differentiation, Jiang Lu, Joseph B. Kadane, and Peter Boatwright, server1.tepper.cmu.edu/gsiadoc/WP/2006-

E57.pdf), but we can use these to predict msrp from other variables.

Here are scatterplots of three potential predictors, Wheelbase (in), Displacement (cu in), and Bore (in).

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Comment on the appropriateness of using these variables as predictors on the basis of the scatterplots.

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Business Statistics

ISBN: 9780321716095

2nd Edition

Authors: Norean D. Sharpe, Paul F. Velleman, David Bock, Norean Radke Sharpe

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