You take a sample of 40 high-school graduates, and ask them their annual incomes. They give you an average income of $35,000 per year. Assume the population standard deviation is known to be $10,000....

You take a sample of 40 high-school graduates, and ask them their annual incomes. They give you an average income of $35,000 per year. Assume the population standard deviation is known to be $10,000. What is a 99% confidence interval for the population mean income of high-school graduates?

Group of answer choices