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Problem: The HR manager of a water-bottling company wants to estimate the proportion of employees that are pleased with the cleanliness of the bathrooms. She considers two methods of obtaining a sample of 550 employees from the 3,500 employees at the company.
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Part A: To make the process easier, the manager considers surveying the first 550 employees who enter a company's annual conference center. Identify the type of sampling method proposed and discuss why this sampling method might be biased.
Part B: The second method the HR manager is contemplating involves a stratified random sample of 550 employees. The company has two campuses with male and female employees at each campus. What circumstances would stratification by campus give a more precise approximation of the proportion of employees who are satisfied with the cleanliness of the bathrooms than stratification by gender?
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