Question: Calcium hardness is measured hourly for a public swimming pool. Data (in ppm) for the last 32 hours are shown in Table 5E.13 (read down

Calcium hardness is measured hourly for a public swimming pool. Data (in ppm) for the last 32 hours are shown in Table 5E.13 (read down from left). The process target is 160 186 190 206 157 195 189 210 150 179 185 216 = 175 ppm.

1511 184 182 212 153 175 181 211 154 192 180 202

a. Estimate the process standard deviation.

b. Construct a CUSUM chart for this process using standardized values of h = 5 and k = 1/2.

160 186 190 206 157 195 189 210 150 179 185 216 1511 184 182 212 153 175 181 211 154 192 180 202 158 186 183 205 162 197 186 197

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