14-2 : Using the following data, prepare a run chart, scatter chart, and control chart. A late surgery is defined as any surgical operation that was started more than30 minutes after its scheduled time. ( Table 14-4 )

Table 14-4: Number of Late Surgeries

Month                             Number of Surgeries                       Number of Late Surgeries

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Jan                                         435                                                                      112

Feb                                       401                                                                      129

Mar                                      572                                                                      186

April                                    409                                                                       103

May                                     577                                                                         89

June                                    329                                                                         67

July                                     467                                                                         156

Aug                                     301                                                                         94

Sept                                   235                                                                          89

Oct                                     325                                                                         127

Nov                                    378                                                                         156

Dec                                    444                                                                          124

Total                                 4873                                                                       1432