Suppose the mean height in inches of all 9th grade students at one high school is 2 estimated. The population standard deviation is 2 inches. The heights of 7 randomly selected students are 72, 72, 66, 73, 60, 72 and 62. T= Ex: 12.34 Margin of error at 99% confidence level = Ex: 1.23 99% confidence interval = [ Ex: 12.34 Ex: 12.34 [smaller value, larger value] 2 Check Next