A pediatrician’s records showed the mean height of a random sample of 25 girls at age 12 months to be 29.530 inches with a standard deviation of 1.0953 inches. (a) Construct a 95 percent confidence interval for the true mean height. (b) Could normality reasonably be assumed for this population? (c) What sample size would be needed for 95 percent confidence and an error of ± .20 inch? (Data are from a project by statistics students Lori Bossardet, Shannon Wegner, and Stephanie Rader.)
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