Babies: According to a recent report, a sample of

240

one-year-old baby boys in the United States had a mean weight of

25.5

pounds. Assume the population standard deviation is

=5.1

pounds.

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Part 1 of 3

(a) Construct an

80%

confidence interval for the mean weight of all one-year-old baby boys in the United States. Round the answer to at least one decimal place.

An

80%

confidence interval for the mean weight in pounds of all one-year-old baby boys in the United States is

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