Question

The following is a sample of 25 measurements. The data are saved in the LM2_94 file.
a. Compute x-bar, s2, and s for this sample.
b. Count the number of measurements in the intervals x-bar ± s, x-bar 2s, and x-bar 3s. 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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  • CreatedMay 20, 2015
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