The data in Table 9E.3 are temperature readings from a chemical process in C, taken every two minutes. (Read the observations down, from left.) The target value for the mean is 0 = 950.

(a) Estimate the process standard deviation.
(b) Set up and apply a tabular CUSUM for this process, using standardized values h= 5 and k = ½. Interpret this chart.

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-TABLE 9E.3 Chemical Process Temperature Data 953 985 949 937 959 948 958 952 945 973 941 946 939 937 955 931 972 955 966 954 948 955 947 928 945 950 966 935 958 927 941 937 975 948 934 941 963 940 938 950 970 957 937 933 973 962 945 970 959 940 946 960 949 963 963 933 973 933 952 968 942 943 967 960 940 965 935 959 965 950 969 934 936 973 94 956 962 938 981 927