The average monthly cell phone bill was reported to be $52.36 by the U.S. Wireless Industry. Random sampling of a large cell phone company found the following monthly cell phone charges (in dollars): 54.83      59.88      62.98       60.42 68.47      52.45      49.20       48.02 58.60      51.29      51.15       49.45 At the 0.05 level of significance, can it be concluded that the average phone bill has increased?

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