During the production of 15-ampere circuit breakers, samples are taken at periodic intervals and tested for the exact amperage at which they break a circuit. Each sample consists of n = 4 circuit breakers. For the following data, representing the results from the past 20 samples, construct one or more appropriate control charts and comment on the state of control of the process.

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Measurement Number Sample Number 3 4 14.7 14.8 15.1 15.2 15.2 15.1 14.8 15.1 15.0 15.0 15.0 15.2 15.1 15.2 4 14.7 15.1 15.2 15.2 14.7 15.2 15.1 15.0 15.2 15.2 15.6 14.7 14.8 15.2 14.9 15.2 14.7 15.0 14.9 15.4 14.9 9. 14.9 14.6 10 15.1 15.0 15.2 14.7 11 15.1 14.7 14.8 15.1 15.0 14.8 12 15.3 14.5 13 15.3 14.6 14.9 15.2 15.1 14 15.1 15.0 15.4 15 15.2 14.1 14.9 16 15.3 15.9 15.4 15.6 17 16.2 15.9 15.5 15.1 15.0 14.9 14.9 18 15.9 16.6 19 14.7 15.8 14.7 20 15.1 15.2 16.9 15.6