# Question

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.

(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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