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| Q. |
If the coefficient of determination is 0.81, the correlation coefficient |
| A. | is 0.6561 |
| B. | could be either + 0.9 or - 0.9 |
| C. | must be positive |
| D. | must be negative |
| Answer» B. could be either + 0.9 or - 0.9 | |
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