7. A recent report of the average age of robbery victims stated that the mean age was 63.5 with a population standard deviation of 1.9 years. A city police chief wishes to see if his city differs from the national average age. He randomly selects 30 case files and determines the average age of robbery victims in his city to be 61.9 years. At a = 0.05, does his city differ from the rest of the nation?

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