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### 11 Cards in this Set

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 Positive relationship A relationship between two variables where increases in one variable tend to be accompanied by increases in the other variable. Negative relationship A relationship between two variables where increases in one variable tend to be accompanied by decreases in the other variable. Perfect relationship A relationship where the actual data points perfectly fit the specific form being measured. For a Pearson correlation, the data points fit perfectly on a straight line. Sum of products A measure of the degree of covariability between two variables; the degree to which they vary together Pearson correlation A measure of the direction and degree of linear relationship between two variables Significance of a correlation A demonstration that a sample correlation so large that it is very unlikely to have come from a population where the correlation is zero. Coefficient of determination The degree to the variability in one variable can be predicted by its relationship with another variable: measured by r squared Spearman correlation A correlation calculated for ordinal data. Also used to measure the consistency of direction for a relationship Monotonic relation A relationship that is consistently one-directional Point-bacterial correlation A correlation between two variables where one of the variables is dichotomous Phi-coefficient A correlation between two variables both of which are dichotomous