| Two Variables | Positive, Negative, or Zero Correlation? | Why? (Third Variable) |
|---|---|---|
| 1. Ice cream sales and murder rate | ____________ | ____________ |
| 2. Learning to read and number of baby teeth | ____________ | ____________ |
| 3. Child gender and sex of parent | ____________ | ____________ |
| For each of these three pairs of variables, indicate whether the correlation between them is positive, negative, or non-existent. Then try to think of a third variable that would determine the direction of the correlation. | ||