Construct a 95% confidence interval of the population standard deviation for the18. The thickness of a plastic film (in mm) on a substrate material is thought to beinfluenced by the temperature at which the coating is applied. In completelyrandomized experiment, 11 substrates are coated at 52°C, resulting in a samplemean coating thickness of 2.63 mm and a sample standard deviation of 0.26 mm.Another 13 substrates are coated at 66°C for which a sample mean of 2.53 mmand a sample standard deviation of 0.51 mm are observed. The Minitab output ofthe test for two variances is as given. Assume that the first and second samplesgiven in the output are the substrates coated at 52°C and 66°C respectively.Assume also that the distribution of the thickness of plastic films is normal.Test and CI for Two VariancesMethodNull hypothesisAlternative hypothesiso (First)/o (Second) = 1o (First)/o( Second) # 1F method was used.This method is accurate for normal data onlyStatisticsSampleSt DevVariances95% CI for StDevs(0.182, 0.456)(0.366, 0.842)First110.2600.068Second130.5100.260TestsTest Statistic0.26MethodDF1DF2P Value10120.041thickness of a plastic film (in mm) on a substrate material at 52°C.

Given: For sample 1, i.e, substrates coated at 52°C. Sample size=n1=11Sample mean=x¯1=2.63Sample…

Answered: Construct a 95% confidence interval of…

A First Course in Probability (10th Edition)

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Author:Sheldon Ross

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Chapter1: Combinatorial Analysis

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Construct a 95% confidence interval of the population standard deviation for the thickness of a plastic film (in mm) on a substrate material at 52°C