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A confidence level is used as a mathematical statistical estimate to indicate the accuracy of the wireless phase II location in the system. This is because a confidence level represents the probability or likelihood that a certain range of values will include the true value. In this context, the confidence level represents the accuracy of the wireless phase II location. The other options, including standard deviation, margin of error, and uncertainty measure, are all statistical measures that can be used in different contexts and for different purposes, but they are not specifically used to indicate the accuracy of wireless phase II location.