The siberian husky is a medium dog, weighing between 16-27kg (35-60lbs). these dogs have strong pectoral and leg muscles, allowing them to move through dense snow. if they had heavier muscles, they would sink deeper into the snow and move slower. yet, if they had lighter muscles, they would not be strong enough to pull sleds and equipment. this is an example of which type of natural selection?

Aconcession manager at yankee stadium wants to know how temperature affects beer sales. she took a sample of 10 games and recorded the number of beers sold and the temperature in the middle of the game. temperature 80 68 78 79 87 74 86 92 77 84 number of beers 20533 1439 13829 21286 30985 17187 30240 87596 9610 28742 a. draw a scatter plot of the data. b. the manager estimates the regression equation to be: numberofbeers = −100, 678 + 1, 513 ∗ temperature draw this on your scatter plot. c. for one of the estimated points, indicate the residual with ei . d. for that same point, indicate what part of the variation is explained by the model with ˆyi − y¯.