In a study of red/green color blindness, 800 men and 2650 women are randomly selected and tested. Among the men, 70 have red/green color blindness. Among the women, 7 have red/green color blindness. Test the claim that men have a higher rate of red/green color blindness. (a.) The test statistic is. (b) Construct the 90% confidence interval for the difference between the color blindness rates of men and women.