38. Chief Henry Batter of the Gotham City Police Department is trying to reduce the time...

Transcribed Image Text:

38. Chief Henry Batter of the Gotham City Police Department is trying to reduce the time required to answer the phone at police headquarters (in fractions of a minute). The data are provided in the C08 Problem Data workbook, and represent time in fractions of minutes for three individual readings taken at random for 25 days. Use the X&MR Excel template with a 3-period moving range to construct an x- and moving range-chart for this series of data and interpret the results. How does the estimate of the standard deviation based on the average range, which is used in the x-chart, compare to the actual standard deviation of the data? Gotham City Police Department Day 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Observation 2 1 3 0.780 0.760 0.770 0.770 0.750 0.770 0.760 0.790 0.750 0.760 0.750 0.750 0.780 0.800 0.740 0.750 0.780 0.730 0.750 0.740 0.760 0.770 0.740 0.770 0.710 0.770 0.760 0.760 0.750 0.760 0.730 0.770 0.740 0.780 0.750 0.770 0.770 0.730 0.770 0.730 0.730 0.790 0.790 0.750 0.760 0.770 0.750 0.760 0.710 0.750 0.750 0.770 0.790 0.750 0.760 0.780 0.780 0.720 0.710 0.750 0.790 0.780 0.780 0.790 0.760 0.750 0.720 0.780 0.750 0.790 0.730 0.790 0.760 0.760 0.780 38. Chief Henry Batter of the Gotham City Police Department is trying to reduce the time required to answer the phone at police headquarters (in fractions of a minute). The data are provided in the C08 Problem Data workbook, and represent time in fractions of minutes for three individual readings taken at random for 25 days. Use the X&MR Excel template with a 3-period moving range to construct an x- and moving range-chart for this series of data and interpret the results. How does the estimate of the standard deviation based on the average range, which is used in the x-chart, compare to the actual standard deviation of the data? Gotham City Police Department Day 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Observation 2 1 3 0.780 0.760 0.770 0.770 0.750 0.770 0.760 0.790 0.750 0.760 0.750 0.750 0.780 0.800 0.740 0.750 0.780 0.730 0.750 0.740 0.760 0.770 0.740 0.770 0.710 0.770 0.760 0.760 0.750 0.760 0.730 0.770 0.740 0.780 0.750 0.770 0.770 0.730 0.770 0.730 0.730 0.790 0.790 0.750 0.760 0.770 0.750 0.760 0.710 0.750 0.750 0.770 0.790 0.750 0.760 0.780 0.780 0.720 0.710 0.750 0.790 0.780 0.780 0.790 0.760 0.750 0.720 0.780 0.750 0.790 0.730 0.790 0.760 0.760 0.780