Which Statement(s) Are Correct About the Factorial Plot Shown Here

Which statement(s) are correct about the Factorial Plot shown here? (Note: There are 3 correct answers) .  

A) When the cutting speed increased from low to high level, the tool age increases
B) The coefficient of the metal hardness is positively related to the output of tool age
C) The coded coefficient is lower for cutting speed than the cutting angle related to the output of tool age
D) These plots prove a statistically significance factor with 95% confidence
E) These plots are an example of interaction plots

Correct Answer:

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