Bergans of Norway has been making outdoor gear since 1908. The following data show the temperature rating (F°) and the price ($) for 11 models of sleeping bags produced by Bergans (Backpacker 2006 Gear Guide).

a. Develop a scatter diagram for these data with temperature rating (F°) as the independent variable.
b. What does the scatter diagram developed in part (a) indicate about the relationship between temperature rating (F°) and price?
c. Use the least squares method to develop the estimated regression equation.
d. Predict the price for a sleeping bag with a temperature rating (F°) of 20.

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Temperature Rating (F° 12 24 Model Price (S) Ranger 3-Seasons Ranger Spring Ranger Winter Rondane 3-Seasons Rondane Summer Rondane Winter Senja Ice Senja Snovw Senja Zero Super Light Tight & Light 319 289 389 239 149 289 359 259 13 3 15 129 199 45