Chapter Summary 455 8 Chapter Summary Example(s) Review Exercises What Did You Learn? Section 8.1 How to determine whether two samples are independent or dependent 1 1–4 How to perform a two-sample z@test for the difference between two means m1 and m2 using independent samples with s1 and s2 known z = 1x1 - x22 - 1m1 - m22 sx1-x2 2, 3 5–10 Section 8.2 How to perform a two-sample t@test for the difference between two means m1 and m2 using independent samples with s1 and s2 unknown t = 1x1 - x22 - 1m1 - m22 sx1-x2 1, 2 11–18 Section 8.3 How to perform a t@test to test the mean of the differences for a population of paired data t = d - md sd 1n 1, 2 19–24 Section 8.4 How to perform a two-sample z@test for the difference between two population proportions p1 and p2 z = 1 np 1 - np 22 - 1p1 - p22 B pqa 1 n1 + 1 n2b 1, 2 25–30 Study Strategies Taking Text Notes Notes can be a vitally important aid to actively learning course material. How you take notes is a personal choice. Three common systems for taking notes include the outline system, the Cornell system, and the concept map system. • The outline system provides clear structure. Ideas are organized by level of importance. Roman numerals are used to list key ideas to signify that they are more important than the supporting details. The outline system works well for students who think linearly or learn verbally. • In the Cornell system, a block of notes is structured with a recall or cue column on the left, a notes column on the right, and a summary area at the bottom. Such a structure allows you to easily test yourself by covering either the recall or the notes column. • The concept map system uses different shapes to help identify levels of importance and connections. Because it uses a visual style to show relationships between ideas, it is highly suited for students who learn visually. For more information, visit Skills for Success in the accompanying MyLab course.
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