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Operations Mgmt With Std Dvd 9E - Problems Set

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The manager of a travel agency has been using a seasonally adjusted forecast to predict demand for packaged tours. The actual and predicted values are as follows: Period Demand Predicted1 138 111 2 194 200 3 157 150 4 91 94 5 95 80 6 132 144 7 126 128 8 127 124 9 95 96 10 149 150 11 104 94 12 85 75 13 120 140 14 134 128 ________________________________________ a. Compute MAD for the fifth period, then update it period by period using exponential smoothing with? =.1.(Round your intermediate calculations and final answers to 3 decimal places.) tPeriod ADemand MADt1 138 2 194 3 157 4 91 5 95;6 132;7 126;8 127;9 95;10 149;11 104;12 85;13 120;14 134;b. Compute a tracking signal for periods 5 through 14 using the initial and updated MADs. (Negative values should be indicated by a minus sign. Round your intermediate calculations and final answers to 3 decimal places.) tPeriod ADemand TrackingSignal1 138 2 194 3 157 4 91 5 95;6 132;7 126;8 127;9 95;10 149;11 104;12 85;13 120;14 134;Checkout time at a supermarket is monitored using a mean and a range chart. Six samples of n = 20 observations have been obtained and the sample means and ranges computed;Sample Mean Range Sample Mean Range1 3.06.42 4 3.13.462 3.15.44 5 3.06.463 3.11.41 6 3.09.45________________________________________Q 2,Factors for three-sigma control limits for and R charts;FACTORS FOR R CHARTSNumber of Observations in Subgroup,n Factor for Chart,A2 LowerControl Limit,D3 UpperControl Limit,D42 1.88 0 3.273 1.02 0 2.574 0.73 0 2.285 0.58 0 2.116 0.48 0 2.007 0.42 0.08 1.928 0.37 0.14 1.869 0.34 0.18 1.8210 0.31 0.22 1.7811 0.29 0.26 1.7412 0.27 0.28 1.7213 0.25 0.31 1.6914 0.24 0.33 1.6715 0.22 0.35 1.6516 0.21 0.36 1.6417 0.20 0.38 1.6218 0.19 0.39 1.6119 0.19 0.40 1.6020 0.18 0.41 1.59;a. Using the factors in the above table, determine upper and lower limits for mean and range charts.(Round your intermediate calculations and final answers to 4 decimal places.);Upper limit for mean;Lower limit for mean;Upper limit for range;Lower limit for range;b. Is the process in control? YesNo

 

Paper#35255 | Written in 18-Jul-2015

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