The article Measuring and Understanding the Aging ofKraft Insulating Paper in Power
Chapter 7, Problem 33(choose chapter or problem)
The article Measuring and Understanding the Aging ofKraft Insulating Paper in Power Transformers (IEEEElectrical Insul. Mag., 1996: 2834) contained the followingobservations on degree of polymerization for paperspecimens for which viscosity times concentration fell in acertain middle range:418 421 421 422 425 427 431434 437 439 446 447 448 453454 463 465a. Construct a boxplot of the data and comment on anyinteresting features.b. Is it plausible that the given sample observations wereselected from a normal distribution?c. Calculate a two-sided 95% confidence interval for trueaverage degree of polymerization (as did the authors ofthe article). Does the interval suggest that 440 is a plausiblevalue for true average degree of polymerization?What about 450?
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