Problem

The following is a sample of 25 measurements. The data are saved in the LM2-94 file. 7661...

The following is a sample of 25 measurements. The data are saved in the LM2-94 file.

7	6	6	11	8	9	11	9	10	8	7	7	5
9	10	7	7	7	7	9	12	10	10	8	6

a. Compute , s2 , and s for this sample.
b. Count the number of measurements in the intervals , , and . Express each count as a percentage of the total number of measurements.
c. Compare the percentages found in part b with 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?