it's North versus the South Magazine A claims that there is no difference between mean incomes of citizens who live in the Northern half of the USA and those who live in the Southern half of the USA. It is known that the population standard deviation of incomes in the USA is $9,000. Magazine claims that there is a difference. Magazine randomly surveys 250 Northerners and finds that the mean income is $79,000 with a standard deviation of $11,000. Magazine randomly surveys 320 Southerners and finds that the mean income is $76,000 with a standard deviation of $12,000. Conduct a hypothesis test to determine which magazine is right.