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 as follows:

Use Excel to develop an x Ì… chart to determine if the process is stable or not.

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Two-HourPlywood PlyoodPlywood PlywoodPlywood erio 0.642 0.612 0.659 0.691 0.689 0.705 0.584 0.644 0.685 0.618 0.630 0.599 0.594 0.621 0.628 0.586 0.634 0.639 0.656 0.640 0.641 0.640 0.693 0.649 0.646 0.636 0.713 0.678 0.725 0.631 0.703 0.602 0.668 0.679 0.649 0.635 0.672 0.640 0.675 0.607 0.625 0.604 0.640 0.650 10 0.652 0.641 0.720 0.597 0.629 0.572 0.696 0.612 0.631 0.675 12 0.666 0.679 0.670 0.609 0.617 13 0.673 0.662 0.622 0.644 0.656