Suppose the mean height in inches of all 9th grade students at one high school estimated. The population standard deviation is 3 inches. The heights of 8 randomly selected students are 66, 65, 74, 66, 63, 69, 63 and 68.
Ex: 12.34
Margin of error at 99% confidence level = Ex: 1.23
99% confidence interval = [ Ex: 12.34 Ex: 12.34 1
[smaller value, larger value]