A district manager of a grocery store wanted to determine if the total revenue for the stores in a region had dropped since last year. The manager collected data from 10 stores in the region. Instead of using the standard deviation from the survey, the manager decided to use the financial data for the last year to assume that the population standard deviation of revenue is $28.1 thousand. Last year, the mean regional revenue was $61.4 thousand. The manager conducts a one-mean hypothesis at the 5% significance level, to test if the average revenue decreased from the previous year of $61.4 thousand. For this test: Ho : u - $61.4, Hajdu