Transcription of Comparing One or Two Means Using the t-Test
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Comparing One or Two Means Using the t-Test
3 Comparing One or TwoMeans Using the t-TestThe bread and butter of statistical data analysis is the Student s was named after a statistician who called himself Student but whosereal name was William Gossett. As an employee of Guinness Brewery inDublin, Ireland, he tackled a number of practical statistical problems relatedto the operation of the brewery. Since he was discouraged from publishingunder his own name, he adopted the Student of Gossett s work, today s researchers have in their toolbox whatis probably the most commonly performed statistical procedure, the most typical use of this test is to compare Means , which is the focus ofthe discussion in this chapter .
See the section “Observe the Distribution of Your Data” in Chapter 2 for a discussion of tests for normality. Comparing One or Two Means Using the t-Test—— 51 Length 4.02 4.01 4.00 3.99 3.98 3.97 3.96 3.95 Figure 3.2 Boxplot of the Bolt Data Since the bolts will be out of design whether they are too short or too long, we test the ...
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