CHALLENGE ACTIVITY 4.7.1: Confidence intervals for population means. 443092 2368586.qx9zgy7 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 8 randomly selected students are 72, 72, 68, 60, 65, 73, 62 and 68. 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] Check Next