Following their manufacture, plastic shims are sampled at periodic intervals and their thickness (in millimeters) measured. Each sample consists of n = 3 shims, and the following data have been collected for the past 20 samples. Given these measurements, use one or more appropriate 3-sigma control charts in evaluating whether the process is in control.

Transcribed Image Text:

Measurement (mm) Sample Number 47.7 55.4 51.6 45.3 48.9 46.5 55.0 49.5 53.7 48.4 46.7 48.8 48.1 55.6 54.3 48.4 46.2 52.4 48.1 52.7 51.8 47.9 47.9 45.5 49.4 46.3 44.3 50.3 47.6 49.2 51.1 49.8 48.8 52.5 54.6 48.3 46.3 51.8 51.7 46.5 42.7 53.9 47.6 57.4 47.0 47.5 51.1 43.9 49.2 41.8 43.9 48.7 50.9 42.8 44.4 47.6 50.3 49.1 53.5 49.2 10 12 13 14 15 16 17 18 19 20