Chapter 6 The t-test and Basic Inference Principles
Chapter 6The t-test and Basic InferencePrinciplesThe t-test is used as an example of the Basic Principles of statistical of the simplest situations for which we might design an experiment isthe case of a nominal two-level explanatory variable and a quantitative outcomevariable. Table shows several examples. For all of these experiments, the treat-ments have two levels, and the treatment variable is nominal. Note in the table thevarious experimental units to which the two levels of treatment are being appliedfor these If we randomlyassignthe treatments to these units this willbe a randomized experiment rather than an observational study, so we will be ableto apply the word causes rather than just is associated with to any statisti-cally significant result.
Principles The t-test is used as an example of the basic principles of statistical inference. One of the simplest situations for which we might design an experiment is the case of a nominal two-level explanatory variable and a quantitative outcome variable. Table6.1shows several examples. For all of these experiments, the treat-
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