30 .a variance envelope has been established on a project. The envelope goes from +-30% in RD to +-5% during manufacturing. The reason for the change in thickness of the envelope is because: 1. the management reserve has been used up. 2. the accuracy of the estimates in manufacturing are worse than the estimates in R_D 3. tighter controls are always needed as a project begins to wind down. 4. of the personal desires of the project sponsor 5. none of the above
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