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A random sample of 16 obsevations is drawn from a nomal distibution with known population vaiance of 1. The sample has a mean of 0.5

A random sample of 16 obsevations is drawn from a nomal distibution with known population vaiance of 1. The sample has a mean of 0.5 and a sample vaiance of 1. The 2-sided 95% confidence inteval for the mean of the distibution is

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