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I have two graphs here and I would like to know if there is a relationship between the variable on X-axis with the one on Y-axis of each of the graphs.

Well level vs Pb content Well level vs As content

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    $\begingroup$ We don't do this for you so I'm guessing your question is "How can I check for a relationship between these two variables?" - the first thing you'll need is the data behind these graphs, do you have that? $\endgroup$ – Lio Elbammalf Nov 8 '19 at 12:53
  • $\begingroup$ You can fit a regression line to the data in each case & test the null hypothesis that the slope is not statistically significantly different from 0. $\endgroup$ – Michael R. Chernick Nov 8 '19 at 15:26
  • $\begingroup$ Yes, I have the data behind these graphs. Do you need them ? $\endgroup$ – Mike Nov 9 '19 at 14:11
  • $\begingroup$ I've added the regression lines to the data in each case. $\endgroup$ – Mike Nov 9 '19 at 14:28
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Regression line to "Well level vs Pb content"

Regression line to "Well level vs As content"

Here are the regression lines to the data in each case.

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