7 6 9 11 8 9 11 9 10 8 7 7
5 9 10 7 7 7 7 9 12 10 10 8 6
a. compute x (with line over), s^2, and s for this sample
b. count the number of measurements in the intervals x (with line over) + and - s, x (with line over) + and - 2s, x (with line over) + and - 3s. Express each count as a percentage of the total number of measurements.
c. compare the percentages found in part b to the percentages given by the empirical rule and chebyshev's rule.
d. calculate the range and use it to obtain a rough approximation for s. Does the result compare favorably with the actual value for s found in part a?
The expert computes the samples for line over.