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1_24 - (Example in Hannaway High … More autonomy Low …...

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Scatter Plot • It illustrates the relationship between two variables – Strength (weak vs. strong) – Direction (positive vs. negative) (example) Correlation • Numerical indicator of the “linear” relationship •D i rec t ion • “+” values indicate “positive” relationship. •“ ” values indicate “negative” relationship. • Strength (magnitude of the value) (example of interpretations)
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(examples) Correlation Matrix (standard presentation) Var1 Var2 Var3 Var4 Var1 1 0.5 0.4 0.6 Var2 0.2 0.3 Var3 1 0.4 Var4 1 (alternative presentation) Var2 Var3 Var4 Var1 0.5 0.4 0.6 Var2 0.2 0.3 Var3 0.4
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Unformatted text preview: (Example in Hannaway) High …. More autonomy Low …. Less autonomy 0 …. Non-urban 1 …. Urban • Correlation does not tell any causal relationship. (Example) • Research question: “Does parent involvement increases their child’s achievement?” • Evidence: “There exists strong positive correlation between parent involvement at school and student’s achievement.” • Possible explanations: – Parent involvement causes increases in achievement. – Higher achievement increases parent involvement. – Some other third variable influences both parent involvement and student achievement (e.g., parents’ attitude toward the importance of education)....
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