Bath concentrations are measured hourly in a chemical process. Data (in ppm) for the last 32 hours… 1 answer below »

Bath concentrations are measured hourly in a chemical process. Data (in ppm) for the last 32 hours are shown in Table 9E.4 (read down from left). The process target is μ0 = 175 ppm.

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(a) Estimate the process standard deviation.

(b) Construct a tabular cusum for this process using standardized values of = 5 and  width=

TABLE 9 E .4

Bath Concentration

160

186

190

206

158

195

189

210

150

179

185

216

151

184

182

212

153

175

181

211

154

192

180

202

158

186

183

205

162

197

186

197

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