CHALLENGE ACTIVITY 6.2.1: Confidence intervals for population means. 270604.2179714.qx3zqy7 Jump to level 1 1 Suppose the mean height in inches of all 9th grade students at one high school is 2 estimated. The population standard deviation is 5 inches. The heights of 7 randomly selected students are 73, 75, 62, 74, 62, 71 and 60. C = 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] 1 2 Check Next