09 Descriptive Statistics

# 09 Descriptive Statistics - 1 DESCRIPTIVE STATISTICS Class...

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11/2/2016 1 DESCRIPTIVE STATISTICS Class 9 1 LECTURE OUTLINE Mean Median Mode Variance Standard Deviation Correlation & Covariance DESCRIPTIVE STATISTICS Describing your groups DESCRIPTIVE STATISTICS Psychologists want to DESCRIBE behavior Describing groups We describe groups in terms of their measured behaviors. We describe the relationships between variables. NO CAUSAL INFERENCE 4 5 6

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11/2/2016 2 DESCRIPTIVE STATISTICS Measurements that summarize data sets as they are, without comparison. DESCRIPTIVE STATISTICS Central Tendency Mean Median Mode Variability Variance Standard Deviation Co-variability Covariance Correlation Coefficient MEAN Average The sum of scores divided by the number of scores. 𝑀 = σ 𝑥 𝑛 7 8 9
11/2/2016 3 Marginal Means Grand Mean MEDIAN The score at which 50% of the scores are below this point and 50% are above this point. Note: This is a measure that is affected by the distribution of scores (not their values)

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