=+30. Dirt bikes. Off-road motorcycles (often called “dirt bikes”) are a segment (about 18%) of the growing motorcycle market. Because dirt bikes offer great variation in features, they are a good market segment to study to learn about which features account for the cost (manufacturer’s suggested retail price, MSRP) of a bike. Researchers collected data on 2005-model dirt bikes (lib

.stat.cmu.edu/datasets/dirtbike_aug.csv). Their original