A random sample of 87 observations produced a mean x= 25.4 and a standard deviation s= 2.4. 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 (24.89 25.91|) (Use integers or decimals for any numbers in the expression. Round to two decimal places as needed.) b. The 90% confidence interval is (24.97.25.83) (Use integers or decimals for any numbers the expression. Round to two decimal places as needed.) c. The 99% confidence interval is (24.72, 26.1). (Use integers or decimals for any numbers in the expression. Round to two decimal places as needed.)

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