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Methods for Problem Solving

## Use a Cause and Effect Diagram to Identify Potential Causes of Various Problems

Provide a short answer to each of the following questions.

1.Use a cause and effect diagram to develop a list of potential causes for each of the following:

a.Failure to earn an A on an examination.

b.You consistently arrive late for class or work.

c.You consistently slice when hitting a golf ball with your driver.

d.Your table lamp fails to light when you turn the switch on.

2.Prepare a flow chart for getting to work or school in the morning. Discuss areas for improvement revealed by the flow chart.

3.You have collected the following data from customer comment cards at your restaurant. Construct a Pareto diagram to show which of the problems should be investigated first. Show the cumulative frequency line on your diagram.

Comment               Frequency

Dirty dishes              11

Dirty silverware        18

Inattentive service    98

Cold food                 23

Wrong order             5

Overpriced               35

Long wait                 4

4.Use the following data to construct a scatter diagram. Does there appear to be a relationship between hours of overtime and number of rejects? Discuss.

Hours of Overtime   Number of Rejects

127                             33

90                              25

95                               23

160                             40

10                                9

80                               19

27                               14

103                             28

48                                1

65                               31

5.Your boss has asked you to evaluate the reject percentage for the past year on one of the production lines. Use the following data to construct a run chart. Does there appear to be a pattern in the change in reject rate over the year?

Month              Reject %

January                3.7

February              3.3

March                  3.1

April                    3.5

May                     3.3

June                    2.7

July                     3.0

August                 2.3

September           2.5

October               2.2

November           1.6

December            1.7