MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER "Unknown cultural affiliations and loss of identity at high elevations." These are words used to propose the hypothesis that archaeological sites tend to lose their identity as altitude extremes are reached. This idea is based on the notion that prehistoric people tended not to take trade wares to temporary settings and/or isolated areas. As elevation zones of prehistoric people (in what is now the state of New Mexico ) increased, there seemed to be a loss of artifact identification. Consider the following information. Elevation Zone Number of Artifacts Number Unidentified 7000-7500 ft 107 5000-5500 ft 145 Let p, be the population proportion of unidentified archaeological artifacts at the elevation zone 1000-7500 feet in the given archaeological area. Let p, be the population proportion of unidentified archaeological artifacts at the elevation zone 5000- 5500 feet in the given archaeological area. I USE SALT (a) Find a 90% confidence interval for p, - p,. (Use 3 decimal places.) lower limit upper limit