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18 download_doc-5.php - L esson 4 I Summary Stats and...

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Lesson 4 I. Summary Stats and Population Parameters a. Definition i. Reduces a data set to a single # with a specific well-known meaning b. Names i. Parameters 1. Describe populations 2. Represented by lower case Greek letters a. ii. Statistics 1. Describe samples 2. Represented by lower case Latin letters a. c. Types i. Measures of central tendency 1. Determine: a. physical center of the data b. location of data on a # line c. center of balance → or a “rep” value of the set ii. measures of dispersion 1. Describe: a. How spread out b. How diverse II. Measures of Central Tendencies
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a. Arithmetic Mean i. AKA average ii. iii. Notation 1. Parameter: 2. Statistic: iv. Importance 1. All quantitative data have 1 and only one mean 2. All observations in that data set are used in its calculation 3. Deviations a. The distance of any obs. from the mean i. b. The sum of the deviations from the mean is: i. ii. “Balance point” v. Drawbacks 1. It is influenced by outliers vi. Another form for mean 1. Weighted mean a. For data sets with multiples identical entries i.
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ii.
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