What is the slope of the least squares regression line of number of service calls on number of copiers? A. 0.86 b. 1.56 c. 0.48 d. none of these e. can"t tell from information given In the setting of the previous problem, about what percent of the variation in number of service calls is explained by the linear relation between number of service calls and number of machines? A. 86% b. 93% c. 74% d. none of these e. can"t tell from information given Outdoor temperature influences natural gas consumption for the purpose of heating a house.