spaceisland Posted April 2, 2009 Report Share Posted April 2, 2009 Blahhhhh I only have to finish the last graph, but I have lost the initial data from the first set of girls from 1-20 that is given.... Is there anyone who could possibly help me by sharing this info with me??? Reply Link to post Share on other sites More sharing options...
Mahuta ♥ Posted April 2, 2009 Report Share Posted April 2, 2009 Is it data given by the assignment it self or is it data you worked out?If it's data you worked out then that would be considered as sharing asnwers, which is not allowed. Reply Link to post Share on other sites More sharing options...
wanderer Posted April 14, 2009 Report Share Posted April 14, 2009 (edited) hey can anyone help me with finding the data from another country.. well for the rest of the people out there.. i think the polynomial would be the best idea.. use ur calculator and ull get an almost perfect curve if u do a x^3 or x^4 regression...as of now only having problem finding the data from another country..just cant believe that we are doing task 1 and task 2 portfolio's back to back in 2 weeks.. this pressure is killing me..but atleast now m working on schedule!!plus i found something from bahrain but its only from age group 6-18 so does that work for the last question? Edited April 14, 2009 by wanderer Reply Link to post Share on other sites More sharing options...
deissi Posted April 14, 2009 Report Share Posted April 14, 2009 Yes, 6-18 should be fine. If you look, you'll find plenty of links in this thread, too. Reply Link to post Share on other sites More sharing options...
wahyan32 Posted April 23, 2009 Report Share Posted April 23, 2009 (edited) actually..i tried to use periodic funtions but the problem is that the equation is not even in a wave form...how do we find the period?? Please help me btw do u guys recommend using excel i tried mathmatica but i cudnt find a way to get rid of the line of best fit Edited April 23, 2009 by wahyan32 Reply Link to post Share on other sites More sharing options...
deissi Posted April 23, 2009 Report Share Posted April 23, 2009 Use Graphical Analysis 3.4. Google to find it online. Use a line of best fit for the wave function, it's easy with GA. Reply Link to post Share on other sites More sharing options...
SailorMelina Posted April 27, 2009 Report Share Posted April 27, 2009 When we're creating an equation in question two that fits the graph, is it all right to just take the general form of whatever model we're using and plug in numbers from the original data to come up with an equation? I just need to show all that work, right? Reply Link to post Share on other sites More sharing options...
uhmmitsrach Posted May 10, 2009 Report Share Posted May 10, 2009 i'm really confused and I feel like i'm making this more complicated than it should be....I'm trying to figure out how to do the second part. "What type of function models the behaviour of the graph? Explain why you chose this function. Create an equation (a model) that fits the graph."I know i want to use a cubic equation in the form of y=ax^3+bx^2+cx+d. i dont know how to solve for variables a,b,c,d and to be honest i dont understand how to explain why i chose to use a cubic apart from that the shape looks like it could fit. could anyone please help me on how to manually find the equation for the model of a cubic? Reply Link to post Share on other sites More sharing options...
deissi Posted May 10, 2009 Report Share Posted May 10, 2009 Use matrices; look at how to solve simultaneous equations using matrices, and you'll find the answer. Reply Link to post Share on other sites More sharing options...
noortje Posted May 16, 2009 Report Share Posted May 16, 2009 It's polynomial of 3rd degree or higher. Should you choose this option, I've posted the instructions on how to obtain polynomial of any degree (up to maximum number of points in your set of data, to be precise) here. You will find data for median BMI of females here. Another option is to mess around with the sine or cosine function. I can also assist you with this one if you like, but I'd go for polynomials if I were you. your postings don't work! help...Hey all I've been trying to find some past IB SL Type II math papers and the ones I've found have been ridiculously long.How long (number of pages) was your BMI task?Oh where did you find them???? I've been looking everywhere for an example! Reply Link to post Share on other sites More sharing options...
NotreDameWatson. Posted May 27, 2009 Report Share Posted May 27, 2009 Our Maths teacher gave us a program to download (Autograph 3.0) which you can get a 30 day free trial of.And from that..Plug in all the data, then just try find an equation to match it using Trial and Error....Okay, not exactly an 100% Mathematical approach; but we looked a sample piece which used Trial and Error and they got 19/20. So, might as well mess around with it.P.S. You can just right click on the data points and add a line of best fit to any power; but you don't get good marks for it.Hope this helped;I'm struggling though this as we speak =] Reply Link to post Share on other sites More sharing options...
thinkgreen95 Posted May 27, 2009 Report Share Posted May 27, 2009 lol yeh i have no idea what a gaussian function is.. and since its due on friday I think i'll stick with the cubic for this one and mm i understand that it repeats, which BMI clearl doesnt..but its also not meant to go negative, so im considering it within a specified domain...what would the difference be then?BMI doesnt repeat but it does have many local mases and mins...you could rotate a cubic or quartic or even a cinctic so that it meets all of the generic maxes and mins which would represent the normal female cycles in cellulite gain just use tan2theta=B/A-C for radian measure of rotation and it should work out finethats what I'm doing but this is only my second IA, but I got a 19 on my first one Reply Link to post Share on other sites More sharing options...
thinkgreen95 Posted May 28, 2009 Report Share Posted May 28, 2009 Hey all I've been trying to find some past IB SL Type II math papers and the ones I've found have been ridiculously long.How long (number of pages) was your BMI task?Roughly 20 pages cause my graphs were huge, but my teacher says that less than 10 pages can get you a very high mark as well.My last one was 39 pages long single spaced and around 80 pages double spaced but thats because I went way in depth. There were people with 20 page long papers who got really good scores too tho so it needent be quite that long Reply Link to post Share on other sites More sharing options...
thinkgreen95 Posted May 28, 2009 Report Share Posted May 28, 2009 I would actually suggest doing a quartic or cinctic polynomial as there are 3 inflection points just in the data given with the first point being an inflection. Reply Link to post Share on other sites More sharing options...
chrisdan Posted May 31, 2009 Report Share Posted May 31, 2009 Where do you get info from another country?? i have tried lots of stuff but cant find a good set of data? Reply Link to post Share on other sites More sharing options...
emmiez Posted June 4, 2009 Report Share Posted June 4, 2009 Hi,is it possible to manually model a cubic function without using matrices? I haven't even learned about matrices yet.. so I only know how to model quadratic equations... Reply Link to post Share on other sites More sharing options...
emmiez Posted June 5, 2009 Report Share Posted June 5, 2009 Also, in question 1 what is meant by the 'variables'? Reply Link to post Share on other sites More sharing options...
firetruck Posted August 9, 2009 Report Share Posted August 9, 2009 I have stated the obvious limitations, like lifestyle, and the fact that it is only limited to a certain range, but likei need more! please!Any help wud be appreciatedThanks Reply Link to post Share on other sites More sharing options...
Ruan Chun Xian Posted August 9, 2009 Report Share Posted August 9, 2009 Do you want to explain the assignment first? We're not mind readers... Reply Link to post Share on other sites More sharing options...
firetruck Posted August 9, 2009 Report Share Posted August 9, 2009 Do you want to explain the assignment first? We're not mind readers...The Body mass index maths SL portfolio, we model a function that imitates the BMI graph, and then discuss limitations to the model >< As far as i know there is only one BMI portfolio >.> Reply Link to post Share on other sites More sharing options...
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