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7) A simple CPM network has three activities, A, B, and C. A is an immediate predecessor of B and of C. B is an immediate predecessor of C. The activity durations are A= 4, B= 4, C= 9. A) The critical path is A-B-C, duration 13. B) The critical path is A-C, duration 12. C) The critical path is A-B-C, duration 17. D) The critical path cannot be determined without knowing PERT expected activity times. E) The network has no critical path. 8) Suppose that the demand in period 1 was 7 units, demand in period 2 was 9 units and the demand in period 3 was 9 units. Assume that the forecast for period 1 was for 5 units. If the firm uses exponential smoothing with an alpha value of .20, what should be the forecast for period 4? (Round answers to two decimal places.) A) 9.00 B) 3.72 C) 6.70 D) 5.00 E) 6.12 9) If two variables were perfectly correlated, what would the coefficient of correlation r equal? A)-1 B) O C) 1 D) B or C E) A or C