An article contained the following observations on degree of polymerization for

Question

An article contained the following observations on degree of polymerization for paper specimens for which viscosity times concentration fell in a certain middle range 415 420 422 423 425 427 432 434 437 438 446 447 449 452 456 462 465 (a) Construct a boxplot of the data 420 430 440 450 O 420 430 440 450 460 O 420 430 440 450 460 O 420 430 440 450 460 Comment on any interesting features. (Select all that apply.) There are no outliers The data appears to be centered near 438 The data appears to be centered near 428 There is one outlier. The data is strongly skewed There is little or no skew. (b) Is it plausible that the given sample observations were selected from a normal distribution? O No (c) Calculate a two-sided 95% confidence interval for true average degree of polymerization. (Round your answers to two decimal places.) Does the interval suggest that 434 is a plausible value for true average degree of polymerization? O No Does the interval suggest that 456 is a plausible value? O No

Explanation / Answer

Solution:

(a) C, third diagram

There are no outliers

The appears to be centered near 438

(b) Is it plausible that the given sample observations were selected from a normal distribution?

Yes

(c)Calculate the two-sided 95% confidence interval for true average degree of polymerization.

(430.34,446.13)

Does the interval suggest that 434 is a plausible value for average degree of polymerization?

No

Does the interval suggest that 456 is a plausible value ?

No

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