Sugar consumption. Based on prior studies, a dental researcher is willing to assume that the standard deviation

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Sugar consumption. Based on prior studies, a dental researcher is willing to assume that the standard deviation of the weekly sugar consumption in children in a particular community is 100 g.

(a) How large a sample is needed to estimate mean sugar consumption in the community with a margin of error 10 g at 95% confidence?

(b) How many kids should be studied if the researcher is willing to accept a margin of error of 25 g at 95% confidence?

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