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A sample of size 25 is selected from a normal population. This sample has a mean of 15 and the population variance is 4.
Using this information, construct a 95% confidence interval for the population mean, m. A. 15 ± 1.96(2). B. 15 ± 1.96(0.4). C. 15 ± 1.96(0.8). D. 15 ± 1.96(4). |