Question: Web traffic can be measured to help highlight security problems or indicate a potential lack of bandwidth. Data on Webtraffic (in thousand hits) from http://en.wikipedia.org/wiki/Web_

Web traffic can be measured to help highlight security problems or indicate a potential lack of bandwidth. Data on Webtraffic (in thousand hits) fromhttp://en.wikipedia.org/wiki/Web_traffic are given in the following table for 25 samples each of size 4.

Sample , 163.95 164.54 163.87 165.10 163.18 2 163.30 162.85 165.10 3

(a) Use all the data to determine trial control limits for XÌ… and R charts, construct the chart, and plot the data.

(b) Use the trial control limits from part (a) to identify out-of-control points. If necessary, revise your control limits, assuming that any samples that plot outside the control limits can be eliminated.

Sample , 163.95 164.54 163.87 165.10 163.18 2 163.30 162.85 165.10 3 163.13 165.14 162.80 163.81 163.43 4 164.08 164.03 163.77 165.44 163.63 163.95 164.78 164.14 165.22 163.83 164.91

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