The thickness of a plastic film (in mils) on a substrate material is thought to be influenced by the temperature at which the coating is applied. A completely randomized experiment is carried out. Eleven substrates are coated at 125oF, resulting in a sample mean coating thickness of and a sample standard deviation of s1 = 10.2. Another 13 substrates are coated at 150oF, for which and s2 = 20.1 are observed. It was originally suspected that raising the process temperature would reduce mean coating thickness. Do the data support this claim? Use a = 0.01 and assume that the two population standard deviations are not equal. Calculate an approximate P-value for this test.