1. Explain the differences between fixed and random factors inDesign of Experiments (DoE).

2. Explain the three pillars of DoE.

3. What are the differences between replication andrepetition?

4. In plastic injection molding, temperature, time in mold, andinjection pressure each play an important role in determining thestrength of the part. At MAR Inc., experimenters are studying theeffects on part strength when the temperature is set at either250o, 275o, or 300oF; the time in mold is either 5, 7, or 9seconds; and the injection pressure is either 200, 250, or 300 psi.Create a table show the factors and their levels for thisinformation.

5. For the information in problem 4, how many tests would benecessary to test every possible treatment (a full factorialexperiment)?.

6. A team is currently working to redesign a compressor assemblycell. The team has several design changes that they want to testusing design of experiments. They want to decrease the cell’sassembly and packing throughput time. Currently, it takes 45minutes to assemble and pack a compressor. The team is consideringthree changes: Reduce current 36 inch conveyor width to either 18inch or 24 inch; Install new parts presentation shelving, eitherflat surfaced or angled Line form: either straight or curvedImplement the first four steps of the experiment design process inslide 15. Comment on how to interpret and verify the results