At least one corporation was sued for manufacturing defective heart defibrillators. Listed below are the numbers of defective defibrillators in successive batches of 1000. Construct a control chart for the proportion p of defective defibrillators and determine whether the process is within statistical control. If not, identify which of the three out-of-control criteria apply.
8 5 6 4 9 3 12 7 8 5 22 4 9 10 11 8 7 6 8 5
Use the given process data to construct a control chart for p. In each case, use the three out-of-control criteria listed near the beginning of this section and determine whether the process is within statistical control. If it is not, identify which of the three out-of-control criteria apply.