Question: The data shown in Table 10E.9 are concentration readings from a chemical process, made every 30 minutes (read down, then across from left to right).

The data shown in Table 10E.9 are concentration readings from a chemical process, made every 30 minutes (read down, then across from left to right).

(a) Calculate the sample autocorrelation function and provide an interpretation.
(b) Construct an individuals control chart with the standard deviation estimated using the moving range method. Provide an interpretation of this control chart.

(d) Are the residuals from the model in part (c) uncorrelated? Does this have any impact on your interpretation of the control chart from part (c)?

a TABLE 10E.9 Chemical Process Concentration Readings 190 196 199 203 208 201 207 197 189 189 196 193 201 207 198 204 195 196 188 195 189 195 192 196 208 194 196 199 197 197 192 195 210 196 197 197 198 194 198 199 202 192 189 188 214 211 212 214 194 199 201 198 194 194 197 196 200 208 6-MR/d2-3.64/1.128 3.227

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