Jump to level 1 Suppose the mean height in inches of all 9th grade students at one high school is estimated. The population standard deviation is 4 inches. The heights of 9 randomly selected students are 60, 67, 75, 60, 75, 71, 67, 68 and 73. ac = 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 section? 16 1 Provide feedback