A company selling licenses for the new e-commerce computer software advertises that firms using this software obtain, on average throughout the first year, a minimum yield of 10% on their initial investments. A random sample of ten of these franchises produced the following yields for first year of operation:
6.1, 9.2, 11.5, 8.6, 12.1, 3.9, 8.4, 10.1, 9.4, 8.9
Supposing that population yields are normally distributed, test the company's claim with a significance level of 5% (.05).