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IB Math SL IA help needed!!

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Hi, so for my IA topic I chose to explore if there's a correlation between race/country and adoption. I've run into a problem though because I'm focusing on 5 different countries and then the number of adoptions from each of those countries over 19 years so I have 5 seperate scatter plots. If I try to find the correlation based off each scatter plot, it would be between the number of adoptions and years for just that one country, instead of all the countries and adoption rate as a whole. How can I fix that? Do I look at it a different way or am I just focusing on it the wrong way? Please help!!

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