- Correlation
- Strength (-1.0 to 0 to +1.0)
- Direction
- Positive Relationship
- Negative Relationship
- Scatterplot
- Pearson’s Product Moment Correlation Coefficient (r)
- Coefficient of Determination (r2)
- Causality
- Relationship
- Cause First
- No other Factors
- Limitations
- Non-linear Relationship
- Homogeneous Groups
- Measurement Floor or Ceiling
- Unreliable Measure
- Excel
- Statistical Significance (alpha) (p)
- Critical Value
- df
- Measurement Scales
- Nominal
- Ordinal
- Interval
- Ratio