H
Histogram—7QC Tool
What Question(s) Does the Tool or Technique Answer?
How is the data of a process distributed; what does the data set look like? Are the data normally distributed?
A histogram helps you to
• Graphically display a data set to help indicate whether a process is distributed approximately normally.
• Determine the shape of the data—skewed or not, location of central tendency, spread.
• Analyze whether a process can meet customer requirements (that is, the spread). See Also “Process Capability Analysis,” p. 486.
• Understand if the output from two or more processes is different. (See Also “Hypothesis Testing,” p. 335)
Alternative Names and Variations
This tool is also known as
• Frequency plot
• Area chart
• Bar chart or bar graph ...
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