Discuss the below:
Q: The data in the following table are individual temperature readings from a chemical process in oC, taken every two minutes (read in sequence top to bottom and left to right). The target value for the mean is 950 oC. (a) Estimate the process standard deviation. (b) Set up and apply a tabular cusum chart for this process, using standardized values h = 5 and k = ½. (c) Interpret the cusum chart. (c) Plot the temperature data in this problem as an EWMA control chart using lambda = 0.1 and L = 2.7. Interpret the EWMA control chart in comparison to the cusum chart.
|
954
|
971
|
950
|
937
|
959
|
949
|
959
|
942
|
|
944
|
969
|
940
|
946
|
938
|
936
|
955
|
930
|
|
973
|
961
|
967
|
955
|
948
|
956
|
948
|
927
|
|
944
|
956
|
965
|
935
|
957
|
928
|
940
|
937
|
|
976
|
949
|
933
|
941
|
962
|
939
|
939
|
949
|
|
971
|
957
|
936
|
934
|
972
|
961
|
945
|
969
|
|
958
|
940
|
945
|
959
|
948
|
963
|
964
|
934
|
|
964
|
933
|
951
|
969
|
942
|
943
|
967
|
960
|
|
940
|
964
|
935
|
960
|
965
|
950
|
968
|
934
|
|
935
|
972
|
942
|
957
|
962
|
937
|
972
|
927
|