7.11 A computer systems team is concerned about a data management system. Each day decisions need to be made that relate to the way in which records and data files are to be maintained. Some information is required to be maintained for one day, some for seven days, some for thirty days, some for a year, and some for perpetual storage. Data that is to be maintained for more than seven days must be stored remotely on disk cartridges off the production site. The data cartridges used for the remote off-site storage involve both an acquisition expense and the cost of 57 | maintaining and managing the remote storage system. In an effort to study the stability of the process, weekly reports for the past six months are obtained. The number of data cartridges sent for remote storage each week during this period are presented in the table below. CARTS Week 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Data Cartridges Sent 123 116 115 116 115 120 140 137 141 142 164 148 160 134 162 174 174 176 193 at esity-Hercher Publishing Inc a. Construct an appropriate control chart for these data. b. Is the process in a state of statistical control? Why? c. If the process is not in a state of control, eliminate out of control points and recalculate the trial control limits. 7.11 A computer systems team is concerned about a data management system. Each day decisions need to be made that relate to the way in which records and data files are to be maintained. Some information is required to be maintained for one day, some for seven days, some for thirty days, some for a year, and some for perpetual storage. Data that is to be maintained for more than seven days must be stored remotely on disk cartridges off the production site. The data cartridges used for the remote off-site storage involve both an acquisition expense and the cost of 57 | maintaining and managing the remote storage system. In an effort to study the stability of the process, weekly reports for the past six months are obtained. The number of data cartridges sent for remote storage each week during this period are presented in the table below. CARTS Week 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Data Cartridges Sent 123 116 115 116 115 120 140 137 141 142 164 148 160 134 162 174 174 176 193 at esity-Hercher Publishing Inc a. Construct an appropriate control chart for these data. b. Is the process in a state of statistical control? Why? c. If the process is not in a state of control, eliminate out of control points and recalculate the trial control limits