Chapter 10.3, Problem 19P

Navajo Culture: Traditional Hogans S. C. Jett is a professor of geography at the University of California. Davis. He and a colleague. V. E. Spencer, are experts on modem Navajo culture and geography. The following information is taken from their hook 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 $p_1$ be the population proportion of all traditional hogans in the Fort Defiance region, and let $p_2$ be the population proportion of all traditional hogans in the Indian Wells region.

(a) Find a 99% confidence interval for $p_{{}_1}-p_2$.

(b) 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 $p_{{}_1}-p_2$ in this context.