Q \( \quad \begin{array}{l}\text { 18. Which correlation coefficient BEST represents a moderate, negative correlation? } \\ r=-0.33 \\ r=0.53 \\ r=-0.68\end{array} \)

To determine which correlation coefficient best represents a **moderate, negative correlation**, let's review the typical interpretation of correlation coefficients: - **0.00 to ±0.29**: **Weak** correlation - **±0.30 to ±0.69**: **Moderate** correlation - **±0.70 to ±1.00**: **Strong** correlation Given the options: 1. **\( r = -0.33 \)** - **Interpretation**: Falls within the **moderate negative** range. 2. **\( r = 0.53 \)** - **Interpretation**: This is a **moderate positive** correlation, not negative. 3. **\( r = -0.68 \)** - **Interpretation**: This is on the higher end of the **moderate negative** range, approaching **strong** negative correlation. **Conclusion:** The coefficient **\( r = -0.33 \)** best represents a **moderate, negative correlation**. **Answer:** \( \boldsymbol{r = -0.33} \) best represents a moderate, negative correlation.