The mean income per person in the United States is $43,500, and
the distribution of incomes follows a normal distribution. A random
sample of 14 residents of Wilmington, Delaware, had a mean of
$50,500 with a standard deviation of $11,400. At the 0.010 level of
significance, is that enough evidence to conclude that residents of
Wilmington, Delaware, have more income than the national average?
State the null hypothesis and the alternate hypothesis. State the
decision rule for 0.010 significance level....