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): Medical doctors are looking at the heights of eleven-year-olds. They determine, for 9 eleven-year-olds, a confidence interval for mean height to be (122, 147)

): Medical doctors are looking at the heights of eleven-year-olds. They determine, for 9 eleven-year-olds, a confidence interval for mean height to be (122, 147) cm. Determine the level of confidence if the standard deviation of the heights is 20.16617 cm. Assume sigma is unknown

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