Which pairs of variables most likely have a positive association?

choose exactly two answers that are correct.

a. the amount of safety training a group receives and the number of accidents a group has

b. the number of children in a home and a number of toys in a house.

c. the amount of time spent per day playing video games and the amount of time spent per day reading.

d. the number of questions on a test answered correctly and the score earned on that test.

Let us imagine that the number of automobile accidents in a certain region are related to the regional number of registered automobiles in tens of thousands (b1), alcoholic beverage sales in $10,000 (b2), and decrease in the price of gasoline in cents (b3). furthermore, imagine that the regression formula has been calculated as: y = a + b1x1 + b2x2 + b3x3 where y = the number of automobile accidents, a = 7.5, b1 = 3.5, b2 = 4.5, and b3 = 2.5 calculate the expected number of automobile accidents for a football weekend if the region has 25,000 registered vehicles, $75,000 worth of beer is sold, and a gas war causes a 10 cent drop in a gallon of gas.