Ineed !

the linear regression model for the data set below has an r^2 value of about 0.67.
what does this indicate?

a. about 67% of the differences in the populations can be explained by the regression line
b. about 67% of the predictions made using linear model are correct
c. about 45% of the differences in the populations can be explained by the regression line

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?