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 2 inches. The neights of 7 randomly selected students are 69, 67, 72, 75, 70, 61 and 74 = Ex: 12.34 Margin of error at 90% confidence level = Ex 1.00 90% confidence interval=[ Ex 12.34 Ex 12 64 1 [smaller value, larger value]
