A sample of 20 items from manufacturer A were measured and
Chapter 9, Problem 9.7.17(choose chapter or problem)
A sample of 20 items from manufacturer A were measured and a sample mean of 2376.3 and a sample standard deviation of 24.1 were obtained. Also, a sample of 24 items from manufacturer B were measured and a sample mean of 2402.0 and a sample standard deviation of 26.4 were obtained. (a) Use a one-sided hypothesis test to assess whether there is sufcient evidence to conclude that the items from manufacturer B provide larger measurements on average than these items from manufacturer A. (b) Construct a 95% one-sided condence interval that provides an upper bound on how much larger on average the measurements of the items from manufacturer B are compared with the items from manufacturer A.The data sets given in problems 9.7.189.7.22 can be used to practice the two-sample methodologies presented in this chapter.
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