9.5. 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 l, = 175 ppm. - TABLE OE.4 Bath Concentration 160 186 190 206 158 195 189 210 150 179 185 216 151 184 182 212 153 175 181 211 202 205 154 192 180 158 186 183 162 197 186 197 (a) Estimate the process standard deviation. (b) Construct a tabular CUSUM for this process, using standardized values h= 5 and k = ½. Interpret this

Calculate the Mean Squared Error for the following data: Actual 90 85 96 99 Forecast 91.3 87.6 93.2 98.6 (Keep two decimal places in your answer)

Use and interpret control charts.

Problem 13-8 (Algo) A shirt manufacturer buys cloth by the 100-yard roll from a supplier. For setting up a control chart to manage the Irregularities (e.g., loose threads and tears), the following data were collected from a sample provided by the supplier. SAMPLE IRREGULARITIES C Sp UCL LCL 1 2 2 4 Yes O NO 3 4 5 2 5 3 a. Determine the è, Sp, UCL and LCL for a c-chart with z= 2. (Leave no cells blank. Round up any negative LCL value to "0". Round your answers to 2 decimal places.) 6 7 8 9 10 3 5 4 3 4 b. Suppose the next five rolls from the supplier had three, two, five, three, and seven Irregularities. Is the supplier process under control?