4_CTV - Slide 1 Central Tendency and Variability The two...

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Unformatted text preview: Slide 1 Central Tendency and Variability The two most essential features of a distribution ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Slide 2 Variables have distributions • A variable is something that changes or has different values (e.g., anger). • A distribution is a collection of measures, usually across people. • Distributions of numbers can be summarized with numbers (called statistics or parameters). ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Slide 3 Central Tendency refers to the Middle of the Distribution ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Slide 4 Variability is about the Spread ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Slide 5 1. Central Tendency: Mode, Median, & Mean • The mode – the most frequently occurring score. Can have bimodal and multimodal distributions. ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Slide 6 Median • Score that separates top 50% from bottom 50% • Even number of scores, median is half way between two middle scores. – 1 2 3 4 | 5 6 7 8 – Median is 4.5 • Odd number of scores, median is the middle number – 1 2 3 4 5 6 7 – Median is 4 ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Slide 7 Median (2) • For grouped frequency data, median is the midpoint of the class interval that contains the median. 26/2=13 (between 13 & 14) CI 10- 12. Median is 11. Same for even & odd.Median is 11....
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4_CTV - Slide 1 Central Tendency and Variability The two...

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