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Industrial Statistics with Minitab by Xavier Tort-Martorell Llabres, Lluis Marco Almagro, Pere Grima Cintas

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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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