Confidence Interval Example 2 in this section used only five pairs of data from Data Set 12 in Appendix B. Repeat Example 2 using all of the cases with heights for both the president and the main opponent. The accompanying TI-83/84 Plus calculator display shows results for a 90% confidence interval constructed from the list of differences in height. In this display, x̄ is used instead of d-bar, and sx is used instead of sd. What feature of the confidence interval causes us to reach the same conclusion as in Exercise 4?

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