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Lesson 3: Checking Test Comparability/Scattergrams
Topic: Language Idioms & Spreadsheets/Statistics
Part of:
Unit: Embracing Diversity
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- Focus: Scattergrams are an important visual representation of data. Students need to be able to interpret as well as create scattergrams.
Activities | Introduction | Objectives | Resources & Web Sites
Activities
Activity 3A: Scattergrams by Hand |
(graph, scattergram, hhie-s, spreadsheet, hearing handicap inventory elderly)
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| Activity 3B: Scattergrams by Computer |
(graph, scattergram, hhie-s, computer, spreadsheet, computer skill, hearing handicap inventory elderly) |
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| Entire Lesson Download (6 pages) |
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Introduction
Lesson 3, “Checking Test Comparability/Scattergrams” teaches students how to construct a scattergram graph. Two examples of graphing are provided to be done by hand. A third example is to produce a scattergram using one of the data spreadsheets. The concept of an outlier is taught in this lesson. To establish equivalency between language versions of the HHIE-S, the line of best fit must show a strong positive correlation, have a slope of one, and the intercept must pass through the origin of the graph. Although not formally presented, teachers may wish to extend this lesson by discussing issues of equivalency and systematic errors or bias.
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Objectives
Students will be able to:
- create a scattergram
- draw conclusions from scattergrams
- use the computer to create a scattergram
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Resources & Web Sites
Statistics: Power from Data - Scatterplots http://www.statcan.ca/english/edu/power/ch9/scattergraphs/scatter.htm
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