CHALLENGE ACTIVITY 5.7.1: Confidence intervals for population means. 361666.1905872.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 8 randomly selected students are 65, 70, 65, 60, 68, 64, 68 and 71. D = EX: 12.34+ Margin of error at 95% confidence level = Ex: 1.23 95% confidence interval = [ Ex: 12.34 Ex: 12.34 [smaller value, larger value] 1 2 Check Next Feedback