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16 Cards in this Set
- Front
- Back
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define correlation:
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a statistical technique used to measure and describe a relationship between two variables
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characteristics involve no _______ or ______
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manipulation, control
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characteristics requres __ scores for each individual (_ and _)
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2, x y
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what does direction measure?
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+ or -. positive or negative correlation
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regarding _____, the most common use of correlation is to measure _____-____ or ______ relationships
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form, straightline, linear
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what does correlation measure? 3 _______ of a relationship:
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characteristics. 1) direction 2) form 3) degree (strength)
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+ or - .70 denotes a _____ correlation
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strong
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.50 denotes a _____ correlation
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moderate
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+ or - .30 denotes a _____ correlation
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weak
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the pearso correlation measures the ______ and ______ of the linear relationship between two _______
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degree, direction, variables
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prediction:
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if two variables are known to be related in some systematic way, it is possible to use one variable to make accurate predictions about the other
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validity
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determine if test measures what it claims by seeing if scores correlate with scores on other tests measuring the same thing
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reliability
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to determine if test yields stable, consistent measurements (is reliable), can determine correlation between 2 sets of measurements
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theory varification
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many theories make specific predictions about the relationship between 2 variables
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r^2 is called
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coefficient of determination
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(for correlation btn education and income) if r^2 = .55, this means:
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55% of the variability in income can be accounted for by the relationship with education.
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