My library > MAT 243: Applied Statistics | for Science, Technology, Engin... > 5.2: Confidence intervals for population means E zyBooks catalog ? Help/FAQ CHALLENGE ACTIVITY 5.2.1: Confidence intervals for population means. 388012.2309728.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 6 inches. The heights of 10 randomly selected students are 73, 61, 71, 63, 60, 71, 66, 74, 63 and 63. a = 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 Feedback