In a study of red/green color blindness, 850 men and 2500 women are randomly selected and tested. Among the men, 81 have red/green color blindness. Among the women, 5 have red/green color blindness. Test the claim that men have a higher rate of red/green color blindness.
I calculated 14.85703606 using the formula t=(x1-x2)/sqt s1^2/n1 +s2^2/n2
I am not sure what to do from there to get a 99% confidence interval for the difference between the color blindness rates of men and women