To choose the most appropriate r-value for the scatter plot, I would need to see that plot to make an accurate assessment. However, I can provide some guidance on how to interpret these general r-values:
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r = -0.3: This indicates a weak negative correlation. As one variable increases, the other tends to decrease slightly, but the relationship is not strong.
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r = 0.8: This indicates a strong positive correlation. As one variable increases, the other variable tends to increase as well, and the relationship is quite consistent.
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r = 0.2: This indicates a weak positive correlation. There is some relationship where, as one variable increases, the other may increase slightly, but the correlation is weak.
If the scatter plot shows a clear upward trend, use r = 0.8. If there's a slight upward trend, use r = 0.2. If there’s a downward trend, use r = -0.3. Please evaluate the scatter plot based on these descriptions to choose the best r-value.