Chapter 8, Problem 71P

Use the following information to answer the next flue exerrises’ Of 1,050 randomly selected adults. 360 identified themselves as manual laborers, 280 identified themselves as non-manual wage earners. 250 identified themselves as mid- level managers, and 160 identified themselves as executives. In the survey, 82% of manual laborers preferred trucks, 620% of non-manual wage earners preferred trucks, 5-1% of mid-level managers preferred trucks, and 26% of executives preferred trucks.

71.. Construct a 95% confidence interval. State the confidence interval, sketch the graph, and calculate the error bound.