Based on the scenario that Dr. Akhtar presented in the example, let's practice hypothesis testing once again. Health-care expenditures for people who inject drugs have shown to decrease after they have been treated for hepatitis C. We want to test the claim that the average annual household health-care expenditure is less than the stated $2,700, after treatment for hepatitis C. We take a sample of 25 households and find an average annual health-care expenditure of $2,230, with an estimated standard deviation of $430. Test this claim at a significance level of 0.01