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Estimate the population standard deviant

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Q: A researcher is interested in the average amount of sugar that kindergarten kids eat per day within 4 grams. In a preliminary sample of 36 kids, the amount consumed ranged from 105 grams to 305 grams. The researcher wants to be 97% confident that the margin of error will not be exceeded. How large of a sample must she do if she uses the range rule to estimate the population standard deviant?

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Basic Statistics: Estimate the population standard deviant

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