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18 September, 01:30

The causes of variation in statistical process control are:

A) cycles, trends, seasonality, and random variations.

B) natural causes and assignable causes.

C) producer's causes and consumer's causes.

D) mean and range.

E) Type I and Type II.

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  1. 18 September, 01:45
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    The correct answer is letter "B": natural causes and assignable causes.

    Explanation:

    Statistical Process Control or SPC is a quality-control production process for outputs that can be measured. The approach aims to improve the stability and capability of the production process by reducing variables. Those variables could be natural - arise by common causes, and assignable - arise because of special causes.
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