An X-Bar Control Chart Was Examined and No Data Points

question 230

Multiple Choice

An x-bar control chart was examined and no data points fell outside of the limits. Can this process be considered in control?

• A) Not yet, there could be a pattern to the points.
• B) Not yet, the R-chart must be checked.
• C) Not yet, the number of samples must be known.
• D) Yes.
• E) Both A and B

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Definitions:

Correlation Coefficient

A statistical measure that describes the degree to which two variables move in relation to each other, ranging from -1 to 1.

Perfect Correlation

A statistical relationship indicating a flawless direct or inverse linkage between two variables.

Matched Design

A research design that matches the experimental participants with control participants who are similar on key characteristics.

Epidemiological

Relating to the study of how disease rates vary among different population groups to identify patterns, causes, and control health problems.