A simple random sample of birth weights in the United States has a mean of 3433 g.
Question:
A simple random sample of birth weights in the United States has a mean of 3433 g. The standard deviation of all birth weights is 495 g.
a. Using a sample size of 75, construct a 95% confidence interval estimate of the mean birth weight in the United States.
b. Using a sample size of 75,000, construct a 95% confidence interval estimate of the mean birth weight in the United States.
c. Which of the preceding confidence intervals is wider? Why?
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