6. 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...

Extracted text: 6. 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, 62% of non-manual wage earners preferred trucks, 54% of mid-level managers preferred trucks, and 26% of executives preferred trucks. We are interested in the true percent of executives who prefer trucks. a. Identify the following: x =. n = p = b. Find a 99% confidence interval for the percent of executives who prefer trucks. Solution A p(1-p) Identify values to plug into the formula p ± ( za) Write solution first as p ± EBP:, Write solution in interval notation: (-