How much do seat belts help? In 2013, data was collected from the U.S. Department of Transportation and the Insurance Institute for Highway Safety. According to the collected data, the number of deaths per 100,000 individuals in the U.S would decrease by 24.45 for every 1 percentage point gain in seat belt usage. Let yn = predicted number of deaths per 100,000 individuals in 2013 and x =

seat belt use rate in a given state.

a. Report the slope b for the equation yn = a + bx.

b. If the y intercept equals 32.42, then predict the number of deaths per 100,000 people in a state if (i) no one wears seat belts, (ii) 74% of people wear seat belts (the value for Montana), (iii) 100% of people wear seat belts.