S. C. Jett is a professor of geography at the University of California, Davis. He and a colleague, V. E. Spencer, are experts on modern Navajo culture and geography. The following information is taken from their book Navajo Architecture: Forms, History, Distributions (University of Arizona Press). On the Navajo Reservation, a random sample of 210 permanent dwellings in the Fort Defi­ance region showed that 65 were traditional Navajo hogans. In the Indian Wells region, a random sample of 152 permanent dwellings showed that 18 were traditional hogans. Let p₁ be the population proportion of all traditional hogans in the Fort De­fiance region, and let p₂ be the population proportion of all traditional hogans in the Indian Wells region.

(a) Check Requirements Can a normal distribution be used to approximate the p̂₁ – ­p̂₂ distribution? Explain.

(b) Find a 99% con­fidence interval for p₁ – p₂.

(c) Interpretation Examine the con­fidence interval and comment on its meaning. Does it include numbers that are all positive? all negative? mixed? What if it is hypothesized that Navajo who follow the traditional culture of their people tend to occupy hogans? Comment on the con­fidence interval for p₁ – p₂ in this context.