The cellular phone industry is involved in a fierce battle for customers, with each com- pany devising its own complex pricing plan to lure customers. Since the cost of a cell phone minute varies drastically depending on the number of minutes per month used by the customer, a consumer watchdog group decided to compare the average costs for four cellular phone companies using three different usage levels as blocks. The monthly costs (in dollars) computed by the cell phone companies for peak-time call- ers at low (20 min per month), middle (150 min per month), and high (1000 min per month) usage levels are given in Table 11.3. Construct the analysis of variance table for this experiment.

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Monthly Phone Costs of Four Companies at Three Usage Levels Company Usage Level A B C D Totals Low 27 24 31 23 B-105 Middle 68 76 65 67 B-276 High 308 326 312 300 B=1246 Totals T = 403 T = 426 T = 408 T =390 G=1627