The mean income per person in the united states is 40500

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The mean income per person in the United States is $40,500, and the distribution of incomes follows a normal distribution. A random sample of 18 residents of Wilmington, Delaware, had a mean of $51,500 with a standard deviation of $10,200. At the 0.05 level of significance, is that enough evidence to conclude that residents of Wilmington, Delaware, have more income than the national average?

Reference no: EM13626135

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