Color blindness in Africa. An anthropologist suspects that color blindness is less common in societies that live by hunting and gathering than in Chapter 23 Exercises 517 settled agricultural societies. He tests a number of adults in two populations in Africa, one of each type. The proportion of color-blind people is significantly lower (P < 0.05) in the hunter-gatherer population. What additional information would you want to help you decide whether you accept the claim about color blindness?