Viewing Data

Section 2 Variation Fundamentals

Lesson S02-06

Text: Section 2 pages 33 – 40

Duration: 10 minutes

Are lists of numbers an informative manner for viewing data? Since interesting statistics such as the mean, median, standard deviation and range cannot easily be observed, other methods for displaying information may provide better insights.

Dot plots are a popular way of viewing data.

Another typical tool for looking at data is the histogram. A histogram can provide a sense of the distribution if the process is in control.

Unfortunately, histograms can be somewhat misleading.

Histograms

What can you conclude from this graph?

Jot down your conclusions, questions, or thoughts.
Compare your response to Steven’s comments in the next video.

Trending Process

Nonnormal Distributions

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About Steven Wachs

Steven Wachs has 25 years of wide-ranging industry experience in both technical and management positions. Steve has worked as a statistician at Ford Motor Company where he has extensive experience in the development of statistical models, reliability analysis, designed experimentation, and statistical process control.