National bearings manufactures bearings at plants located in portland, OR, Houston, TX, and Jacksonville, FL. To measure employee knowledge of total quality management, six employees were randomly selected at each plant and tested. The test scores for these employees are given in DATA. Managers want to know if, on average, knowledge of TQM is equal across the 3 plants. Test quality of mean scores at alpha = 0.05.

DATA:

Observation Portland Houston Jacksonville

1 85 71 64

2 75 75 69

3 82 73 67

4 76 74 74

5 71 69 80

6 85 82 72