A quality analyst wants to construct a control chart for determining whether four machines, all producing the same product, are in control with regard to a particular quality attribute. Accordingly, she inspected 1,000 units of output from each machine in random samples, with the following results
For upper and lower control limits of .026 and .014, which machine(s) , if any, appear(s) to be out-of-control for process proportion of defectives?
Definitions:
Besnier's Prurigo
Also known as Atopic Dermatitis, a chronic skin condition marked by itchy and inflamed skin.
Dermatitis
A general term for inflammation of the skin, resulting in redness, itching, and sometimes blistering.
Atopic
Related to atopy, a genetic predisposition toward developing allergic hypersensitivity reactions such as eczema, asthma, or hay fever.
Onycholysis
The separation of the nail from the nail bed, a symptom that can be caused by trauma, infection, or systemic disease.
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