7. Calculate the 90% condence interval for the difference in the population proportion of blue-eyed students for brown and blond-haired students \"by-hand\" by coding the steps in R. Then use an R function to check your results. Report and interpret the interval in the context of the problem. Assume large sample conditions are met. (3 points) Blue Brown Green Hazel Black 20 68 5 15 Blond 94 7 16 10 Brown 84 119 29 54 Red 17 26 14 14 [1] 0. 3686079 0.5242945 attr(, "conf. level") [1] 0.9