Paired t Test Refer to the tire wear data from Table 10.3 (page 424). 1. To perform a paired-difference test for these dependent samples, enter the data into the first two columns of an Excel spreadsheet and select Data Data Analysis t-Test: Paired Two Sample for Means. 2. Follow the directions for the equal variances t test in Example 10.21, and you will generate similar output. For the data in Table 10.3, you obtain the output in Figure 10.22. Again, you can decrease the decimal accuracy if you like, using on the Home tab in the Number group. 3. Using the observed value of the test statistic (12.83) with two-tailed p-value = 0.0002, there is strong evidence to indicate a difference in the two population means.

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D t-Test: Paired Two Sample for Means E F Tire A Tire B Mean 10.24 9.76 Variance Observations 1.733 1.763 5 5 df tStat Pearson Correlation Hypothesized Mean Difference P(T