___________ help us understand whether differences in results can be attributed to random variation or not. 1 point DOE Descriptive statistics statistical inferences None of the above 2. Question 2 ___________ensures we are collecting data that will measure what we want to measure, reducing variation, and give us results that can be generalized 1 point DOE Descriptive statistics statistical inferences None of the above 3. Question 3 An _____________ is an independent variable which may affect a response variable 1 point main effects Treatments Degrees of freedom input factor 4. Question 4 ___________experimentation is done at the same time 1 point Sequential Nested Parallel Screening 5. Question 5 An ____________refers to factors that cannot be controlled in a Taguchi-style fractional factorial experiment. 1 point Interaction effects Main effects Inner array Outer array