We completed the discussion of Chapter 8 by considering a bottling problem (two-sided test) and then a problem with unknown population variance (which required us to use the t-distribution).
Chapter 9 was started with a problem involving the weight losses as a result of using the Atkins diet vs. the conventional diet. In this chapter we still make use of confidence intervals and hypothesis testing, but for two populations. Therefore, we don't encounter any new theory, but some of the formulas slightly differ from what we saw in Chapters 7 and 8. For example, when the variances are not known, we may assume their equality (which must be tested) and then compute the pooled variance.
The class ended by having two students toss 15 tennis balls into a bucket and testing the hypothesis that their success rates are equal. This material is not going to be in the final exam, but we did it to illustrate the use of MegaStat and to have some fun.
We will complete Chapter 9 in Week 11.
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