Question

Tire Pressures. Six samples, each consisting of 10 automobile tires, were selected, and the pressure (in...

Tire Pressures. Six samples, each consisting of 10 automobile tires, were selected, and the pressure (in kilopascals, kPa) in each tire was measured. The tires were filled by a machine on an automobile assembly line. The means and ranges for the samples are shown here. Construct and analyze an ?X chart and an R chart for the data.

Sample 1 2 3 4 5 6
Mean 223.2 242 238 223 229 242
R 26.2 14.5 25.5 15.2 20.7 21.4

Homework Answers

Answer #1

From the given data , we get

For n = 10, A2 = 0.308, D3 = 0.223, D4 = 1.777

Chart

R Chart

Analysis : The process average is out of control because sample 1, 2 4 and 6 lie outside the control limits, and the process variability is in control because all the sample points fall within control limits.

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