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Suppose that you want to estimate the average lifetime of a computer made by Dell. You decide to take a SRS of n Dell computers
Suppose that you want to estimate the average lifetime of a computer made by Dell. You decide to take a SRS of n Dell computers and measure their lifetimes. You want to be fairly accurate in your estimate, so you want your 95% margin of error to be at most .2 of a year. The standard deviation of these lifetimes for the wholepopulationis
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