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 7 randomly selected students are 71, 73 60 72 71 63 and 61 12.34 Margin of error at 9036 confidence level = 90% confidence interval = ( EX:12,34 0 8) Dogs smallenvalue largervalue