When 40 people used the weight watchers diet for one year, their weight losses had a standard deviation of 4.9 pounds (based on data from “comparison of the atkins, ornish, weight watchers, and zone diets for weight loss and heart disease reduction,” by danziger, et al., journal of the american medical association, vol. 293, no. 1). test the claim that the amounts of weight loss have a standard deviation equal to 6.0 lb, which appears

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?