The thickness of a plastic film (in mils) on a substrate material is thought to be
Chapter 10, Problem 10-24(choose chapter or problem)
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 125F, resulting in a sample mean coating thickness of and a sample standard deviation of . Another 13 substrates are coated at , for which and are observed. It was originally suspected that raising the process temperature would reduce mean coating thickness. (a) Do the data support this claim? Use 0.01 and assume that the two population standard deviations are not equal. Calculate an approximate P-value for this test. (b) How could you have answered the question posed regarding the effect of temperature on coating thickness by using a confidence interval? Explain your answer.
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