01C-1-1 (1)

Practical significance practical we have statistical

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Unformatted text preview: ing data obtained from samples using Therefore, any result can be due to chance Therefore, alone alone It’s always a question of probability, never It’s of certainty of Statistical vs. Practical Significance Practical We have Statistical Significance when We Statistical outcome is probably not due to chance outcome We have Practical Significance when We Practical outcome is large enough to make some meaningful difference in real life. meaningful Non-Experimental Research Non-Experimental (Correlational) This type of research can tell us if X and Y covary; i.e. if X and Y are mathematically related. covary; What does the correlation coefficient (Pearson’s r) tell us? (Pearson’s Non-Experimental (Correlational) Research (Correlational) Advantages No manipulation or control of variables required You can use “in vivo” data Avoid many ethical and practical limitations Limitations: Cannot control or manipulate variables No causal conclusions can be drawn Directionality problem 3rd variable problem Non-Experimental Research: Non-Experimental The Directionality Problem If self-esteem and academic If achievement are related, then: achievement Possibility 1: High achievement might cause increased self-esteem Higher Grades Higher SE Non-Experimental Research: Non-Experimental The Directionality Problem If self-esteem and academic If achievement are related, then : achi...
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This document was uploaded on 02/25/2014.

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