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### 30 Cards in this Set

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 Correlation -definition- Numerical statement about the strength of a relationship between 2 inverval-level variables Positive Correlation -definition- Variables move in the same direction (increasing or decreasing) Negative Correlation is also known as... Inverse correlation Negative Correlation -definition- When 1 variable increases, and the other decreases Correlation coefficient ranges from... -1 to +1 A no correlation coefficient has -- value. 0.00 Scattergram -definition- A graphical representation of cases showing simultaneously their values on 2 different variables. Abscissa -definition- Horizontal axis, X-axis, has the independent variable Ordinate -definition- Vertical axis, Y-axis, has the dependent variable The Dependent variable is called the... Criterion Variable The Independent variable is the ... Predictor variable Perfect Correlation -definiiton- Data has a 1.00 correlation When there is a perfect correlation ... You are have total and complete prediction. There is No unexplained variation between the variables. Regression Line is also known as ... Line of Best Fit Regression Line -definition- An imaginary line that can be drawn through All of the data points A regression line is drawn in what kind of correlation? Perfect Correlation Partial Correlation -definition- When you statistically control for the extranewous ones by a correlational procedure Partial correlation produces... A correlation coefficient that allows you to guage the strength of relationship that other variables may be exerting When should outliers be excluded from data analysis? Whenever the outliers are clearly "oddball" cases that seem to be anomalies If you exclude some oddball cases you should... report it to the study Coefficient of Determination -definition- Indicates how much variation within the 2 variables can be explained Example of coefficient of Determination statement From the sample of data obtained, we can explain --% of the variation Is a insignficant correlation reliable? Not very reliable What does a signficance level depend on? It depends on the sample size and whether the data fit a general linear pattern 3 Basic Assumptions/Conditions 1)Data shoudl be measured at the interval level 2) Data should be reasonably linear 3) Variances in x and y should be relatively similar Curvilinear -definition- O-Shaped, U-Shaped, J-shaped, or S-Shaped Curvilinear is also known as... Heteroscedastic Spearman's rho Differences are the values that Spearman's rank-order correlation coefficient uses ot quantify the agreement between the 2 raters Correlation Matrix -definition- Need to compute more than 1 correlation coefficient Regression Equation -definition- A formula expressing a linear relationship Y = a + bX