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In a study of red/green color blindness, 500 men and 2100 women are randomly selected and tested. Among the men, 45 have red/green color blindness. Among the women, 6 have red/green color blindness. Is there sufficient evidence to support the claim that men have a higher rate of red/green color blindness than women?

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The correct answer is

1. Men: x1 = 45, n1=500; x1=47, n1=504 --> pp 1 =47/504 = 0.09325

2. Women: x2 = 6, n2=2100; x2=8, n=2104 --> pp 2 =8/2104 = 0.00380

Use the p -bar method = (x1+x2+2) / (n1 +n2+ 4) = 53 / 2604 = 0.02035

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