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Há 23 horas · Find step-by-step Statistics solutions and your answer to the following textbook question: The piston diameter of a certain hand pump is 0.5 inch. The quality-control manager determines that the diameters are normally distributed, with a mean of 0.5 inch and a standard deviation of 0.004 inch.
Using their customer database, the company randomly selects 40 customers and asks them about their level of satisfaction with the company. What type of sampling is used? A.
