18.1 File ‘CHLORINE’
A chemical industry produces a product, in continuous flow, of which a sample is taken every 15 minutes to control the parameters of interest. The file CHLORINE.MTW contains the pH values and the concentration of chlorine in the samples taken during one week. The file is organized as follows:
| Column | Variable | Label |
| C1 | Date | Corresponding date of the data |
| C2 | Time | The hour the sample is taken |
| C3 | pH | pH value of the sample |
| C4 | Cl | Chlorine concentration (mg/l) |
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