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A previous federal report indicated that 30% of children ages 2 to 5 years had a good diet. That report was done a number of

A previous federal report indicated that 30% of children ages 2 to 5 years had a good diet. That report was done a number of years ago and we want to see a new study to see if that proportion has changed. How large a sample is needed to estimate the true proportion of children with good diets within 2% with 95% confidence?

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