b) Consider the following experiment: Run 123456 7 8 Treatment combination y (1) 8 ad 10 bd 12 ab 7 cd ac 13 6 bc 5 abcd 11 Answer the following questions about this experiment: (i) How many factors did this experiment investigate? (ii) What is the resolution of this design? (iii) Calculate the estimates of the main effects. (iv) What is the complete defining relation for this design?