I'm unable to view images directly, so I can't assess the scatterplots you've mentioned (mc003-1.jpg, mc003-2.jpg, mc003-3.jpg, mc003-4.jpg). However, I can provide some general advice on how to identify scatterplots that do not show a clear relationship:
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Random Distribution: If the points on the scatterplot appear randomly scattered with no discernible pattern (i.e., they don't cluster in any specific direction), then the plot likely does not show a clear relationship.
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Lack of Correlation: If there is no upward or downward trend—meaning the points do not align vertically or horizontally across the graph—this suggests a lack of correlation.
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Wide Spread: If the points are widely spread across the plot with no evident slope, this also indicates that a trend line would not be a good fit.
If you can describe the scatterplots in terms of these characteristics, I could help you identify which one (or ones) do not show a clear relationship.