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An article contained the following observations on degree of polymerization for paper specimens for which viscosity...

An article contained the following observations on degree of polymerization for paper specimens for which viscosity times concentration fell in a certain middle range: 420 425 427 427 432 433 434 437 439 446 447 448 453 454 465 469 Suppose the sample is from a normal population.

(a) Calculate a 95% confidence interval for the population mean, and interpret it.

(b) Calculate a 95% upper confidence bound for the population mean, and interpret it

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