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 |
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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?
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