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Scores on the Cognitive Scale of the Bayley-Scales of Infant and Toddler Development range from 1 to 19, with a standard deviation of 3. Calculate

Scores on the Cognitive Scale of the Bayley-Scales of Infant and Toddler Development range from 1 to 19, with a standard deviation of 3. Calculate the margin of error in estimating the true mean cognitive scale score, with 99% confidence, if there are 12 infants and toddlers in a sample.

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