9.23 A company selling licenses for new e-commerce computer software advertises that firms using this software obtain, on average during the first year, a yield of 10% on their initial investments. A random sample of 10 of these franchises produced the following yields for the first year of operation:

6.6 9.2 11.4 8.4 12.6 5.6 8.9 10.6 9.5 8.79 Assuming that population yields are normally distributed, test the company’s claim at the 1% significance level.