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Maths AA HL IA Please, help


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Hi. I am currently trying to write my math IA and am having some troubles with it😔. My topic is on the effects of Covid 19 on the world population and how long this pandemic will last. I was planning on using the SIR model but now I am not entirely sure as a friend from another class who is also looking at Covid 19 mentioned that SIR model might not be a good model to use as it does not take into consideration some of the changing situations. But my own teacher said that it is fine to use that model.

As of now, I have more or less written out the formulas and explained how the formulas are used but I don't know what to do from there. 

Can someone please advice me on how I should go about continuing my IA? 

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