Huck+Chapter+3

**The Key Concept behind Correlation: Relationship**

 * Must look at data on our two variables simulaneously
 * Must determine if there is a relationship
 * Must determine how strong or weak the relationship is, if one does exist
 * Correlation can be:
 * high-high/low-low
 * high-low/low/high
 * little systematic tendency

**Scatter Diagrams**

 * has horizontal axis and a vertical axis
 * abscissa is marked off numerically to accommodate scores obtained by researcher
 * ordinate is lab led to accommodate scores with other variables

**Correlation Coefficient**

 * Correlation Coefficient- Numerical summaries of bivariate relationships that appear in research reports
 * symbolized as r
 * normally reported as a decimal number between -1.00 and +1.00
 * Correlation Matrrix**
 * Used to summarize data when interest centers on the birariate relationship among many variables
 * Dash- When a row and a coulmn refer to the same variable, there is no correlation positioned at the intersection of that row and column.
 * No correlation coefficients postined below the diagonal of the dashes
 * Different Kinds of Correlational Procedures**
 * Quatitative- How much (number)
 * Qualitative-