7. Designers of backpacks use exotic material such as supernylon Delrin, high-density poly- ethylene, aircraft aluminum, and thermomolded foam to make packs that fit comfortably and distribute weight to eliminate pressure points. The following data show the capacity (cubic inches), comfort rating, and price for 10 backpacks tested by Outside Magazine. Comfort was measured using a rating from 1 to 5, with a rating of 1 denoting average com- fort and a rating of 5 denoting excellent comfort (Outside Buyer's Guide, 2001).

Manufacturer and Model Capacity Comfort Price ($) Camp Trails Paragon II EMS 5500 Lowe Alpomayo 90+20 Marmot Muir Kelly Bigfoot 5200 4330 5500 5500 4700 5200 Gregory Whitney 5500 Osprey 75 4700 Are Teryx Bora 95 5500 Dana Design Terraplane LTW 5800 The Works @ Mystery Ranch Jazz 5000 23434inn 190 219 249 249 250 340 389 5 395 5 439 5 525

a. Determine the estimated regression equation that can be used to predict the price of a backpack given the capacity and the comfort rating.

b. Interpret

b, and by

c. Predict the price for a backpack with a capacity of 4500 cubic inches and a comfort rating of 4.

a. Determine the estimated regression equation that can be used to predict the price of a backpack given the capacity and the comfort rating.

b. Interpret b1 and b2.

c. Predict the price for a backpack with a capacity of 4500 cubic inches and a comfort rating of 4