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