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 3 41.2 45.6 43.7 1 2 47.4 43.7 49.5 41.8 49.7 3 44.9 53.9 42.6 53.7 42.5 49.1 50.1 47.8 44.8 47.1 44.5 43.5 48.3 46.9 49.5 51.4 52.0 54.5 9. 48.6 10 38.9 51.9 47.7 39.4 11 42.5 49.8 12 48.9 52.4 60.9 48.4 13 59.0 56.2 14 39.6 52.4 41.6 53.6 43.4 15 56.8 16 49.8 64.6 57.8 17 58.5 49.4 46.9 49.1 61.1 18 54.5 57.0 19 54.0 57.2 57.0 20 45.2 50.2