The owner of a large company is conducting a survey about job satisfaction, including questions about salary, hours, stress, and other conditions. There are about 800 employees in the company, including 100 executive positions, 650 middle-management positions, and 50 custodial positions. The owner wants to include about 10% of his employees in the survey sample.
Identify a sampling method that might produce a biased sample. Explain why using the method for this survey would be a poor choice.
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stratified sampling because only part of each position can do the survey
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