L2 Statistics

# L2 Statistics - b Median[better measure of center if data is SKEWED always the middle c Mode 2 Variability a Range b Standard Deviation-average

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Statistics I. Statistics is divided into 2 branches A.Descriptive Statistics     -goal is to present the data in a way that’s easy to  understand 1. Central Tendency 2. Variability 3. Tables 4. Graphs 5. z-scores 6. The Normal Curve 7. Correlations B.Inferential Statistics     -use descriptive statistics and probability theory to  make judgments about reality 1. Making judgments from data 2. Tests of significance

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II. Random Sampling vs. Random division  -randomly assign [to avoid bias] -cannot generalize the findings -randomly sample to get a representative sample            A. Descriptive Statistics 1. Central Tendency a. Mean [symmetrical same as  med., more likely to change if data is skewed]

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Unformatted text preview: b. Median [better measure of center if data is SKEWED, always the middle] c. Mode 2. Variability a. Range b. Standard Deviation-average deviation c. Variance-squared SD 3. z- score = (raw score- mean)/ standard dev->Standardized score 4. Normal Curve and z-scores 34% between mean and 1 st z-score 14% between +1 and +2 2% between +2 and +3 68% between -1 and +1 5. Correlation-1.0 to +1.0 Direct + and inverse -Regression line-strength -direction or sign 6. Graphing a. Bar Graph b. Line Graph B. Inferential Statistics 1. z-test 2. t-test 3. F-test or ANOVA 4. Regression 5. Chi Square or Χ 2...
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## This note was uploaded on 11/06/2011 for the course PSY 110 taught by Professor Winters during the Fall '08 term at University of Miami.

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L2 Statistics - b Median[better measure of center if data is SKEWED always the middle c Mode 2 Variability a Range b Standard Deviation-average

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