St. Bernard Dogs. A simple random sample of 36
St. Bernard dog weights yields a sample mean of 193 pounds. It is
known that the standard deviation of the population of all St.
Bernard dog weights is 18 pounds.
Find a confidence interval for the mean weight of all St.
Bernard dogs with 90%, 95%, and 99% confidence level.
What are the margins of error for 90%, 95%, and 99% confidence?
How does increasing the confidence level change the margin of error
of a confidence interval when the sample size and population
standard deviation remain the same?