Anew radar device is being considered for a certain missile defense system. the system is checked by experimenting with aircraft in which a kill or a no kill is simulated. two research group a and b participated the simulation, and it was found that 63 kills occur out of 100 trials by group a, and 59 kills occur out of 125 trials by group b. is there a significant difference between the proportions of group a and b's simulation? use p-value with significance level of 0.05 to draw a conclusion.

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?