A Point That Plots Below the Lower Control Limit on the Range

question 65

Multiple Choice

A point that plots below the lower control limit on the range chart:
I.should be ignored because lower variation is desirable.
II.may be an indication that process variation has decreased.
III.should be investigated for assignable cause.

• A) I and II
• B) I and III
• C) II and III
• D) II only
• E) I, II, and III

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Definitions:

Kruskal-Wallis Test

An approach that is not based on parameter-specific criteria to determine if samples are from the same distribution.

Significance Level

The probability of rejecting the null hypothesis in a statistical test when it is actually true; commonly denoted by alpha.

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Wilcoxon Signed Rank Test

A non-parametric statistical test used to compare two related samples, to assess whether their population mean ranks differ.