Control Charts: Motel Rooms The manager of Motel 11 has

Chapter , Problem 14

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Control Charts: Motel Rooms The manager of Motel 11 has 316 rooms in Palo Alto, California. From observation over a long period of time, she knows that on an average night, 268 rooms will be rented. The long-term standard deviation is 12 rooms. This distribution is approximately mound-shaped and symmetrical. (a) For 10 consecutive nights, the following numbers of rooms were rented each night: Night 1 2 3 4 56 Number of rooms 234 258 265 271 283 267 Night 7 8 9 10 Number of rooms 290 286 263 240 Make a control chart for the number of rooms rented each night, and plot the preceding data on the control chart. Looking at the control chart, would you say the number of rooms rented during this 10-night period has been unusually low? unusually high? about what was expected? Explain your answer. Identify all out-of-control signals by type (I, II, or III). (b) For another 10 consecutive nights, the following numbers of rooms were rented each night: Night 1 2 3 4 56 Number of rooms 238 245 261 269 273 250 Night 7 8 9 10 Number of rooms 241 230 215 217 Make a control chart for the number of rooms rented each night, and plot the preceding data on the control chart. Would you say the room occupancy has been high? low? about what was expected? Explain your answer. Identify all out-of-control signals by type (I, II, or III).