1-1 Statistics in Engineering

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1-1 Statistics in Engineering
1-1 Statistics in Engineering Engineering Example The dot diagram

An engineer is someone who solves problems of interest to society by the efficient application of scientific principles by

Refining existing products
Designing new products or processes

1-1 Statistics in Engineering
The field of Statistics deals with the collection, presentation, analysis, and use of data to

Make decisions
Solve problems
Design products and processes

1-1 Statistics in Engineering

Statistical techniques are useful for describing and understanding variability.
By variability, we mean successive observations of a system or phenomenon do not produce exactly the same result.
Statistics gives us a framework for describing this variability and for learning about potential sources of variability.

1-1 Statistics in Engineering
Engineering Example
An engineer is designing a nylon connector to be used in an automotive engine application. The engineer is considering establishing the design specification on wall thickness at 3/32 inch but is somewhat uncertain about the effect of this decision on the connector pull-off force. If the pull-off force is too low, the connector may fail when it is installed in an engine. Eight prototype units are produced and their pull-off forces measured (in pounds): 12.6, 12.9, 13.4, 12.3, 13.6, 13.5, 12.6, 13.1.
1-1 Statistics in Engineering
Engineering Example

The dot diagram is a very useful plot for displaying a small body of data - say up to about 20 observations.
This plot allows us to see easily two features of the data; the location, or the middle, and the scatter or variability.

1-1 Statistics in Engineering
Engineering Example

The engineer considers an alternate design and eight prototypes are built and pull-off force measured.
The dot diagram can be used to compare two sets of data

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