1. For each pf (i) to (iii) below, state the type of quality variable, sample approach and the best control chart to apply in illustrating the quality variables. i) A manufacturer of centrifuge rotors wants to track the diameter of all rotors produced during a week. The diameters must be close to target because even small shifts cause problems. i) In generating and disseminating advance knowledge through continuous important efforts for the benefit of the students, University M also monitors the students who successfully complete their studies within the prescribed time (GOT). iii) The number of customer complaints or product returns in Company S is only be available on a monthly basis since on certain days; the company did not receive any complaints nor any product returns. The company, however, still would like to chart those numbers to detect quality problems