A sample of 55 night-school students' ages is obtained in order to estimate the mean age of night-school students. x = 25.8 years. The population variance is 30. (a) Give a point estimate for μ. (Give your answer correct to one decimal place.) (b) Find the 95% confidence interval for μ. (Give your answer correct to two decimal places.) Lower Limit   Upper Limit   (c) Find the 99% confidence interval for μ. (Give your answer correct to two decimal places.) Lower Limit   Upper Limit

Question

A sample of 55 night-school students' ages is obtained in order to estimate the mean age of night-school students. x = 25.8 years. The population variance is 30.

(a) Give a point estimate for μ. (Give your answer correct to one decimal place.)


(b) Find the 95% confidence interval for μ. (Give your answer correct to two decimal places.)
Lower Limit  
Upper Limit  

(c) Find the 99% confidence interval for μ. (Give your answer correct to two decimal places.)
Lower Limit  
Upper Limit  

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