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Ch05+Lecture

# Ch05+Lecture - CHAPTER 5 Correlation Quantifying the...

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CHAPTER 5 Correlation: Quantifying the Relation Between Two Variables

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Correlation: Assessing Associations Between Variables > The need for standardization Putting two different variables on the same scale z-score: Transforming raw scores into standardized scores z = ( X - µ ) σ
Figure 5-1: The z Distribution

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Figure 5-2: z Scores Intuitively
The characteristics of correlation coefficient Quantification of the degree of a relationship between two variables Positive Negative Quantification of the magnitude of a relationship between two variables Range of possible values is -1.00 to 1.00 Values close to 0.00 indicate no correlation Values close to (- or +) 1.00 indicate high correlation

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Figure 5-5: A Perfect Positive Correlation
Figure 5-6: A Perfect Negative Correlation

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Check Your Learning Which is stronger? A correlation of 0.25 or -0.74 ?

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The Pearson Correlation Coefficient: Quantifying a Linear Association Is astrology real?
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