CHALLENGE ACTIVITY 5.3.1: Confidence intervals for population means. 400452.2602570.qx3zqy7 Start Suppose the mean height in inches of all 9th grade students at one high school is estimated. The population standard deviation is 3 inches. The heights of 9 randomly selected students are 62, 64, 69, 72, 62, 61, 67, 73 and 75. * = Ex: 12.34 Margin of error at 90% confidence level = Ex: 1.23 90% confidence interval = [Ex: 12.34 Ex: 12.34 ] [smaller value, larger value] 1 Check Next 2 2
