An ad agency tracks the complaints, by week received,about the billboards in its city: WEEK NO. OF COMPLAINTS1 42 53 44 115 36 9 a) What type of control chart would you use to monitor this pro-cess? Why? b) What are the 3-sigma control limits for this process? Assumethat the historical complaint rate is unknown.c) Is the process in control, according to the control limits? Whyor why not?d) Assume now that the historical complaint rate has been fourcalls a week. What would the 3-sigma control limits for thisprocess be now? Has the process been in control according tothe control limits?

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