1-1 Statistics in Engineering



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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

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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