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Lec2Methods - Development Chapter 1 Jennifer Ganger...

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Methods for Studying Child  Development Chapter 1 Jennifer Ganger: [email protected]
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Outline for today Learn which context and design are appropriate for a study Correlation and experimental design Understand and interpret the Pearson r (correlation coefficient) Size and sign Look at graph and estimate r Understand advantages of experimental design over correlational study and importance of random assignment to group
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Contexts for gathering data Independent of type of experiment or type of design
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Correlation (correlational design) What does it tell you? Relationship between two variables Correlation coefficient: r -1 to +1 Size (absolute value) Effect sizes Small is .1 to .3 Moderate is .3 to .5 Large is > .5 Sign r 2 percent of variance accounted for in one variable by the other variable
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Correlated or not?
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r r = 0 r = .25 r = .50 r = .75
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Positive or negative?
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