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Willard Ch 14

Statistics

TermDefinition
correlation coefficient A number, ranging from -1.00 to +1.00, that measures the direction and strength of the relationship between two variables
positive correlation Relationship in which two variables proceed in the same direction: high X scores are associated with high Y scores, and vice-versa.
negative correlation Relationship in which two variables proceed in opposite directions: high X scores are associated with low Y scores, and vice-versa.
perfect correlation In a perfect correlation, many of the dots will be piled on top of each other and, when connected, will form a straight diagonal line.
coefficient of determination Proportion of variance that two variables share in common; proportion of the variance on one variable that is explained by the variance of the other.
coefficient of non-determination Proportion of variability that is not shared, common variance; proportion of the variance on one variable that is not explained by the variance of the other.
linear relationship described by a straight line in which there is a tendency for Y scores to move in only one direction in relation to the X scores.
regression analysis Statistical procedure used to predict the value of a score on one variable by knowing the value of the score on another variable.
slope tells us how much and in what direction the regression line slants.
y-intercept point where the regression line cuts across, or intercepts, the Y-axis.
regression equation An equation for the line of best fit, which is used to predict Y values from given X values.
restricting the range When a sample is used that limits the scores on one or both variables more so than would be found in the population.
outliers scores on either the X or Y variable that are extreme. Can have a dramatic effect on the magnitude of the correlation.
Scatterplot diagram of the relationship between two variables. Positive correlations ascend to the right. Negative correlations decend to the right. More scatter= weaker correlation.
Pearson correlation Used for examining linear relationships between variables measured on interval or ratio scales.
Created by: rowaggerm
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