1. A sample of 70 night-school students' ages isobtained in order to estimate the mean age of night-schoolstudents. x = 25.7 years. Thepopulation variance is 29.
(a) Give a point estimate for ๐. (Give your answer correctto one decimal place.)(b) Find the 95% confidence interval for ๐. (Give your answercorrect to two decimal places.)
(c) Find the 99% confidence interval for ๐. (Give your answercorrect to two decimal places.)
2. Two hundred fish caught in Cayuga Lake had a mean lengthof 13.1 inches. The population standard deviationis 3.7 inches. (Give your answer correct to two decimalplaces.)
(a) Find the 90% confidence interval for the population meanlength.
(b) Find the 98% confidence interval for the population meanlength.
1. A sample of 70 night-school students' ages is obtained in order to estimate the mean age of night-school students. x
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