The article “Measuring and Understanding the Aging of Kraft
Insulating Paper in Power Transformers” (IEEE Electrical Insul.
Mag., 1996: 28–34) contained the following observations on degree
of polymerization for paper specimens for which viscosity times
concentration fell in a certain middle range:
418, 434, 454, 421, 437, 463, 421, 439, 465, 422, 446, 425, 447,
427, 448, 431, 453
(a) Calculate a 99% confidence interval for the true average
degree of polymerization.
(b) Does the confidence interval suggest that µ...