Mathematics, 15.04.2020 05:19 Angel13613

The mean income per person in the United States is $39,000, and the distribution of incomes follows a normal distribution. A random sample of 15 residents of Wilmington, Delaware, had a mean of $50,000 with a standard deviation of $9,600. At the 0.025 level of significance, is that enough evidence to conclude that residents of Wilmington, Delaware, have more income than the national average

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The mean income per person in the United States is $39,000, and the distribution of incomes follows...