An article in Fire Technology investigated two different foam-expanding agents that can be used in the nozzles of fire fighting equipment. A random sample of five observation with an aqueous film-forming foam had a sample mean of 4.7 and a standard deviation of 0.6. A random sample of five observations with alcohol-type concentrates had a sample mean of 6.9 and a standard deviation of 0.8. Assume that both populations are well represented by normal distributions with the same standard deviations (as s1 = 0.6 is close to s2 = 0.8). Do the data support the claim that there are no differences in mean foam expansion?