An X-Bar and R Chart with N=5 Has Been Plotted

question 12

Multiple Choice

An X-bar and R chart with n=5 has been plotted for some time and has demonstrated random variation. Upon review of the last 30 plot points, the expected number of runs around the centerline on the X-bar chart is expected to be approximately which of the following?

• A) 4
• B) 9
• C) 12
• D) 16

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Definitions:

Infarction

Tissue death caused by a local lack of oxygen, due to obstruction of the tissue's blood supply.

Necrosis

The demise of cells or tissues within the body, caused by illness, harm, or insufficient blood flow.

Infarct

An area of dead tissue resulting from the obstruction of blood supply to that area, commonly associated with heart attacks and strokes.

Hgb

Hemoglobin, a protein in red blood cells that carries oxygen throughout the body.