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This data were collected in an experiment to assess the impurity present in a chemical product. The impurity is affected by two factors: pressure and temperature. Montgomery (2001, p. 193) analyzed the data by using the Tukey single-degree-of-freedom test and concluded that there is no evidence of interaction.
A matrix with five rows (Pressures) and three columns (Temperatures):
Pressure 25
Pressure 30
Pressure 35
Pressure 40
Pressure45
Temperature 100
Temperature 125
Temperature 150
Montgomery, D. C. (2001). Design and analysis of experiments, 5th Edition, p 193. John Wiley & Sons.
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