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  1. Sure it is, you can use any function you like provided that you explain it all in a way that makes sense And personally I think using the square root is a great idea.
  2. Um, I know this question might sound stupid provided that the assessment criteria are available in the Internet, but I have read them several times and am not sure about the use of so-called "calculator" notation. It's fine as long as it's not part of word-processed text, right? As in, on graphs and calculator screenshots? I'm only asking because the two IB math teachers I've asked gave mutually exclusive answers (one was like "noooo, don't ever use it", and the other said it was fine as long as it's not part of the text). Also, what exactly is meant by "parameters"? I have defined the constra
  3. I don't think you have to use matrices to solve for sine (and tbh I don't think you can - but you shouldn't believe me, because I'm not a mathematical genius, just trying to help ). I think that you should use the template sine equation AsinB(x-C)+D and use the rules you have learned to solve for these coefficients using the maximum/minimum points of the data set, etc.
  4. maybe some general info about the Olympics/men's high jump discipline? Like since when the Olympics are held, etc. I plan to write 2-3 such opening sentences, more is not required imho.
  5. Thank you anyway The logistic function I got is really great, I mean, obviously it doesn't go through all the points, but this data set is so random that I don't think it's even meant to. It's definetely better than the one I got from GeoGebra or from my GDC (though idk why... I always thought my TI was the smartest little thing out there ). As for the line thickness, I don't think it's a problem, I'll just make the graphs larger than I wanted to initially and it's going to be OK Thanks again!
  6. Logger Pro helped me a lot you can plot all of the individual data points and then create a line of best fit on the same axes for any sort of graph you want plus it gives you the parameters for whichever equation you chose. Really? Thanks It's an expensive program, so I'll just download the trial version and see if it solves my problem Tbh I don't know why GeoGebra can't do it - it gives me a "best fit" equation that is hardly a best fit (I found that could come up with a better one by randomly changing parameters...so something must be wrong with it :/ too bad, I really liked the program...
  7. Logger Pro helped me a lot you can plot all of the individual data points and then create a line of best fit on the same axes for any sort of graph you want plus it gives you the parameters for whichever equation you chose. Really? Thanks It's an expensive program, so I'll just download the trial version and see if it solves my problem Tbh I don't know why GeoGebra can't do it - it gives me a "best fit" equation that is hardly a best fit (I found that could come up with a better one by randomly changing parameters...so something must be wrong with it :/ too bad, I really liked the program...
  8. Desy, First of all, your previous posts in this thread really helped me a lot, so thank you for writing all that But I still have a question: could you please recommend a program (other than GeoGebra, which doesn't work :/, and Autograph, which apparently can do only linear and nth degree polynomials) that could come up with a best-fit logistic function? I wanted to do a logistic function for the "using technology" part, but can't, because no program will give me a function that actually models the data (i.e. all the functions I obtained in GeoGebra just keep increasing indefinetely and don't
  9. Thank you Daniel, your post really helped I've already done my 'real' commentary, and I'm happy to tell you it went well (at least that was my impression)
  10. Any tips on how you should actually structure it? I'm doing a commentary next week, and my mock commentary today was truly awful. I ended up panicking because I tried to say everything at once, so it would be really helpful if anyone here could give me some advice on the structure (especially on how to come up with it in that ridiculously short amount of time we get for preparation).
  11. How did you find Paper 1, was it really difficult?
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