Which statement(s) are correct about the DOE Factorial plot output here?

IASSC ICBB Question Answer

Which statement(s) are correct about the DOE Factorial plot output here? (Note: There are 3 correct answers).

Two factors were operated at 3 levels each

The highest tool age was achieved with metal hardness at high level while keeping the cutting speed at the low level

The design indicated above is a 32 factorial design

The cutting speed and cutting angle are at the low level for the least tool age achieved

All factors had 2 levels in the experiment

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