Do not discuss exams until 24 hours have passed. More information about the rules here.

IB Math Helper

  • Content count

  • Joined

  • Last visited

  • Days Won


IB Math Helper last won the day on August 16 2016

IB Math Helper had the most liked content!

Community Reputation

28 Renowned

About IB Math Helper

Profile Information

  • Gender
  • Exams
    May 2005
  • Country

Recent Profile Visitors

1,368 profile views
  1. Done
  2. Just to be clear about this, the example you provided that got top marks (posted on reddit) was for Math Studies. The criteria for Math studies is completely different from the Math SL criteria. The Math SL IA is marked at a much higher level. Though some things can be learned from the Wards and Supporting IA, it's not a fair comparison. This IA would not get a high mark with the Math SL criteria. I think you're on the right track if you're thinking about the mathematical concepts needed to get a high mark on your IA. (I couldn't read your proposal because you made it by request only. Please change the settings of the document so that anyone can view it). Make sure you have enough math concepts and then focus on the personal engagement component of your IA (meaning what lessons can you draw from it).
  3. First of all, how exactly would you do the correlation? In order to do a correlation, you need numerical values for both the x- and y- variables. Based on your survey, I don't see how you can do a correlation (or linear regression). The only thing I can think of is the chi-square test of independence. But even then, you need to think about how you're going to apply it.
  4. Can you start off by listing your interests? Simply begging for a topic will not help you. Also, how good are you at math?
  5. 2cos(x) = sin(2x) 2cos(x) = 2sin(x)cos(x) cos(x) = sin(x)cos(x) cos(x)-sin(x)cos(x) = 0 cos(x) ( 1 - sin(x) ) = 0 So, cos(x) = 0 which means x = pi/2, 3*pi/2 and 5*pi/2 from 0 to 3*pi and sin(x) = 1 which means x = pi/2 and 5*pi/2 from 0 to 3*pi Hope this helps.
  6. If Sin(B)=2/3, you also need to know in which quadrant B is in. Otherwise, you can have two possible answers. For this question, the double angle is not necessary to find cos(B). Just draw a right angle triangle with the opposite side of 2 and hypotenuse of 3 and use Pythagoras to find the last side. Once you have that, the adjacent to the hypoteneuse is the ratio you want for cos(B).
  7. Go for it but explain it clearly (i.e. step-by-step) because the math here is beyond the scope of the curriculum.
  8. This sounds like the secretary problem. Check out the math here:
  9. To clarify, there is no page limit. The recommended number of pages is between 6-12. However, that's just a recommendation. There are no points deducted for going over. Keep in mind though that more pages does not correlate with better quality. I suggest narrowing the focus on your essay so you can speak precisely about what is needed in your essay.
  10. I don't agree that IB graders mark really hard. I'm an IB marker and I sometimes think the marking at times can be a little generous. It is true that it is hard to get a 7 on your IA but it's doable. If I were you, I would look at some more examples especially ones that scored very well. You can check this site out for some examples and read the comments the markers have given for each criteria. Check it out here:
  11. I would actually stick with the game theory idea since probability trees and expected values are still part of the math sl curriculum and of course tie in with game theory. The prisoner's dilemma, for example, can be modelled as a probability tree diagram and one can also find the expected value of the number of years in prison for different situations. If your game theory topics involves probability and statistics, you should stick with that.
  12. Plagiarism does NOT occur if you choose the same topic. Plagiarism does NOT occur if you use the same methods and mathematics. Plagiarism occurs if you take someone else's work and use it word for word. I highly doubt you have the exact wording in your IA. Which sample IA are you referring to by the way?
  13. The fear from the administration side is why you did it in the first place and what if you drop out again? Ask yourself that. Is the hassle, the pressing deadlines, tough content and confusing questions worth it? If so, then go for it. If not, then just focus on what you are doing right now.
  14. It's definitely an exponential decay but you can also apply the damped sine graph if you want. Both work. You'll need to understand the formula of the damped sine graph and explain why it applies to your data. Generally speaking, the damped sine curve is used when the sine function slows down. For example, if you go bungee jumping the bungee cord exhibits a damped sine curve because it will eventually stop swinging. If you can figure this out, this will work well with your IA.
  15. It's clear that the views per day drop exponentially. You can find the rate at which the two drop exponentially. So if y=Ae^(rx), then r is the rate of continuous growth (or decline in your case). Find this r value for both cases and compare why one is lower than the other.