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4. A pediatrician’s records showed the mean height of a random sample of 25 girls aged...

4. A pediatrician’s records showed the mean height of a random sample of 25 girls aged 12 months to be 29.53 inches with a standard deviation of 1.0953 inches.

a. Construct a 95% confidence interval for the true mean height.

b. What sample size would be needed for 95 percent confidence and an error of +/- .20 inches?

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