Suppose the mean height in inches of all 9th grade students at one high school is estimated. The population standard deviation is 5 inches. The heights of 8 randomly selected students are 63, 75, 65, 61, 73, 72, 71 and 70.

x =

Margin of error at 95% confidence level =

95% confidence interval = [ }; { ]

[smaller value, larger value]