Viscosity measurements on a polymer are made every 10 minutes by an on-line viscometer. Thirty-six observations are shown in Table 9E.5 (read down from left). The target viscosity for this process is µ0 = 3,200.

(a) Estimate the process standard deviation.
(b) Construct a tabular CUSUM for this process, using standardized values h= 8.01 and k = 0.25.
(c) Discuss the choice of h and k in part (b) of this problem on CUSUM performance.

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TABLE 9E.5 Polymer Viscosity 3,169 3,205 3,185 3,188 3,173 3203 3,187 3,183 3.162 3209 3.192 3.175 3.154 3,208 3.199 3.174 3.139 3,211 3.197 3,171 3,145 3.214 3.193 3.180 3,160 3,215 3.190 3,179 3.172 3,209 3.183 3.175 3.175 3.203 3.197 3,174