A random sample of 86 observations produced a mean x= 25.8 and a standard deviation s= 2.6. a. Find a 95% confidence interval for u b. Find a 90% confidence interval for u. c. Find a 99% confidence...

solve c

Extracted text: A random sample of 86 observations produced a mean x= 25.8 and a standard deviation s= 2.6. a. Find a 95% confidence interval for u b. Find a 90% confidence interval for u. c. Find a 99% confidence interval for u. a. The 95% confidence interval is (25.27 26.33) (Use integers or decimals for any numbdes in the expression Round to two decimal places as needed.)