SOLUTION: A random sample of 50 four-year-old’s attending day care centers provided a yearly tuition average of $3987 and the population standard deviation of $630. Find the 90% confidence

Question 1193184: A random sample of 50 four-year-old’s attending day care centers provided a yearly tuition average of $3987 and the population standard deviation of $630. Find the 90% confidence interval of the true mean.
The growing seasons for a random sample of 35 U.S. cities were recorded, yielding a sample mean of 190.7 days and the population standard deviation of 54.2 days. Estimate the true mean population of the growing season with 95% confidence.
In a hospital study, the mean noise level in the 171 ward areas was 58.0 decibels, and the Population standard deviation is 4.8. Find the 90% confidence interval of the true mean.
A health care professional wishes to estimate the birth weights of infants. How large a sample must be obtained if she desires to be 90% confident that the true mean is within 2 ounces of the sample mean? Assume 𝜎 = 8 ounces.
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Answer by ikleyn(52772) (Show Source): You can put this solution on YOUR website!
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