You are given the sample mean and the population standard deviation. Use this information to construct the 90% and 95% confidence intervals for the population mean.
A random sample of 44 gas grills has a mean price of $649.50. Assume the population standard deviation is $57.10.
The 90% confidence interval is ( , )?
The 95% confidence interval is ( , )?
What interval is wider? The 90% confidence interval or the 95% confidence interval?