Example of a bar chart of values in a two-way table

At an umbrella manufacturing facility, umbrella handles are measured and then removed from the assembly line if they don't meet specifications. A daily report indicates how many rejected handles were produced by each of three presses at the facility during each of three shifts. A quality engineer wants to determine whether press and shift are associated. As part of the initial investigation, the engineer creates a bar chart to compare the number of rejected handles for each machine and shift.

  1. Open the sample data, UmbrellaHandles.MTW.
  2. Choose Graph > Bar Chart > Values from a table > Two-way table > Cluster.
  3. In Graph variables, enter '1st shift', '2nd shift', and '3rd shift'.
  4. In Row labels, enter 'Machine ID'.
  5. Click OK.

Interpret the results

The highest number of rejected handles is made by machine 2 during the first shift. The lowest number of rejected handles is made by machine 2 during the 3rd shift.

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