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1. Medical doctors are looking at the heights of eleven year olds. They determine, for 9 eleven year olds, a confidence interval for mean height

1. 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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