Is it reasonable to conclude the mean rate charged is greater than 14 percent? Use the .01 significance level. A recent article in the Wall Street Journal reported that the 30-year mortgage rate is now less than 6 percent. A sample of eight small banks in the midwest revealed the following 30-year rates (percent) 4.8   5.3  6.5  4.8  6.1   5.8  6.2   5.6