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

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20.3 File ‘CATHETER’

A factory that makes catheters for hospital use carries out an inspection of the welding process after the most rigid part is welded to the tip, which is softer. Every hour, a batch of 100 catheters is inspected to detect the possible presence of traces. If the welds have traces, the catheter is defective.
The file named CATHETER.MTW contains the data corresponding to the number of defective catheters, in a batch of 100, during the last week of production. This file is organized as follows:
Variable Label
C1 Date Date corresponding to data in the row
C2 Time Inspection time
C3 Number of defects Number of defective catheters per batch

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