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 10 randomly selected students are 68. 55, 75. 55153.52, 67, 54, 58 and ?1_ E = 3:12.34 MarGin of error at 95% condence level = 3:123 95% condenceintewal = [ Ex:12.34 . Ex: \"12.34 ] [smaller value, larger value] -m