| A | B |
|---|
| Class interval | The upper and lower boundary of a set of scores used in the creation of a frequency distribution. |
| Histogram | a statistical graph of a frequency distribution in which vertical rectangles of different heights are proportionate to corresponding frequencies |
| Frequency polygon | A graphical representation of a frequency distribution. |
| Cumulative frequency distribution | A frequency distribution that show frequencies for class intervals along with the cumulative frequency for each. |
| Skewness | a lack of symmetry about the mean in a frequency distribution |
| Kurtosis | a measure of the extent to which a frequency distribution is concentrated about its mean |
| Platykurtic | The quality of a normal curve that defines its flatness. |
| Leptolkurtic | The quality of a normal curve that defines its peakedness. |
| Correlation coefficient | A numberical index that reflects the relationship between two variables. |
| Pearson product-moment correlation | See Correlation coefficient. |
| Direct correlation | A positive correlation where the values of both variables change in the same direction. |
| Indirect correlation | A negative correlation where the values of variable move in opposite directions. |
| Scatterplot of Scattergram | A plot of paired data points. |
| Linear correlation | A correlation that best expressed as a straight line. |
| Correlation matrix | A set of correlation coefficients. |
| Coefficient of determination | The amount of variance accounted for in the relationship between two variables. |
| Coefficient of alienation | The amount of variance unaccounted for in the relationship between two variables. |
| Coefficient of nondetermination | See Coefficient of alienation. |
