Question: 7. A 90% confidence interval for a population mean based on 144 observations is computed to be (2.7, 3.4). How many observations must be made

7. A 90% confidence interval for a population mean based on 144 observations is computed to be (2.7, 3.4). How many observations must be made so that a 90% confidence interval will specify the mean to within ±0.2?

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