A Population Proportion · Exercise 10
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 percent of manual laborers preferred trucks, 62 percent of non-manual wage earners preferred trucks, 54 percent of mid-level managers preferred trucks, and 26 percent of executives preferred trucks.
Construct a 95 percent confidence interval. State the confidence interval, sketch the graph, and calculate the error bound.
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OpenStax, Statistics · §8.3 A Population Proportion · Exercise 10
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