Refer to Exercise 11.5. Are the population variances the same for scrap rates (3 plants)?
Exercise 11.5
Scrap rates per thousand (parts whose defects cannot be reworked) are compared for 5 randomly selected days at three plants. Do the data show a significant difference in mean scrap rates?

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Scrap Rate (Per Thousand Units) Plant A Plant B Plant C 11.4 12.5 10.1 13.8 13.7 11.1 14.1 16.8 13.2 14.6 10.2 9.5 9.0 13.3 5.9