Question

A lumber company makes plywood for commercial construction. A key quality measure is the thickness of the plywood. Every two​ hours, five pieces of plywood ​(n=5​) are selected and the thicknesses are measured. The data​ (in inches) for the first 20 samples are listed below. Develop an x overbarx chart to determine if the process is stable or not.   Click the icon to view the data for the first 2020 samples. Click the icon to view the values of the Upper A2 constants. The grand mean of the samples is___

​2-Hour Period	Plywood 1	Plywood 2	Plywood 3	Plywood 4	Plywood 5
1	0.605	0.601	0.654	0.699	0.695
2	0.668	0.576	0.635	0.697	0.616
3	0.646	0.617	0.584	0.626	0.634
4	0.563	0.657	0.608	0.657	0.644
5	0.649	0.631	0.699	0.634	0.658
6	0.625	0.712	0.665	0.722	0.626
7	0.704	0.603	0.647	0.669	0.705
8	0.639	0.626	0.663	0.657	0.672
9	0.614	0.619	0.609	0.634	0.641
10	0.663	0.638	0.739	0.587	0.633
11	0.577	0.687	0.605	0.634	0.692
12	0.684	0.662	0.665	0.611	0.615
13	0.684	0.664	0.606	0.633	0.663
14	0.674	0.637	0.617	0.706	0.665
15	0.649	0.666	0.662	0.638	0.622
16	0.676	0.613	0.609	0.681	0.679
17	0.714	0.688	0.686	0.648	0.651
18	0.679	0.648	0.604	0.605	0.674
19	0.668	0.664	0.666	0.629	0.681
20	0.632	0.626	0.632	0.641	0.631

n	Upper A 2A2
2	1.880
3	1.023
4	0.729
5	0.577
6	0.483

Answer 1

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