20. Braking Distances- To compare the braking distances for two types of tires a safety engineer conducts 50 braking tests for each of the tow types
of tires. The results of the tests are shown in the figure. At a= 0.10 can the
engineer support the claim that the mean braking distance for Type C is
greater than the mean braking distance for Type D?

Data from 2005 for various age groups show that for each $100 increase in the median weekly income for whites, the median weekly income of blacks increases by $105. also, for workers of ages 25 to 54 the median weekly income for whites was $676 and for blacks was $527. (a) let w represent the median weekly income for whites and b the median weekly income for blacks, and write the equation of the line that gives b as a linear function of w. b = (b) when the median weekly income for whites is $760, what does the equation in (a) predict for the median weekly income for blacks?