karram Posted December 8, 2008 Report Share Posted December 8, 2008 Hello. This is my first post!! =) I have to start on my Math SL Type II Portfolio. I'm choosing between BMI or fishing rods. Which one is easier to do? I mean, like for example is BMI mainly about matrix? How about fishing rods? Thanks in advance! Reply Link to post Share on other sites More sharing options...
eblake Posted December 13, 2008 Report Share Posted December 13, 2008 HELLO =) I have no idea what fishing rods is about, but, I did the BMI one and it's about data modeling. It's no big deal, you have your TI and regression, as well as Excel. For me that one was really easy. Reply Link to post Share on other sites More sharing options...
npond Posted December 14, 2008 Report Share Posted December 14, 2008 what equation did you use to model the behaviour of the graph? did you use sine? i know how to turn on the regression, but i don't understand what it means. can you please help clarify? Reply Link to post Share on other sites More sharing options...
npond Posted December 14, 2008 Report Share Posted December 14, 2008 this is for the BMI index... were you able to find the BMI of others countries? our class is having trouble finding the info. thanks! Reply Link to post Share on other sites More sharing options...
eblake Posted December 14, 2008 Report Share Posted December 14, 2008 (edited) [quote name='npond' post='30206' date='Dec 13 2008, 09:49 PM']what equation did you use to model the behaviour of the graph? did you use sine?[/quote] wouldnt it be cheating if i told you? [quote name='npond' post='30206' date='Dec 13 2008, 09:49 PM']i know how to turn on the regression, but i don't understand what it means. can you please help clarify?[/quote] your teacher is meant to tell you/you could have googled/here is what it means: you use the regression feature after you've entered the data points you've been given. there are several regression features on your TI: linear, cubic, whatever. you make a judgment here on which one to use, you use it, and your screen gives you an equation plus a bunch of stuff. what you're looking for is the [b]R-squared value [/b]. if it is [b]1[/b], it means the equation that your calculator gave you models the data you put in [b]exactly.[/b] subsequently, if it's like 0.99997, it means the equation fits yours data well but not perfectly. lower than that, you probably chose the wrong regression. Edited December 14, 2008 by eblake Reply Link to post Share on other sites More sharing options...
Abu Posted December 14, 2008 Report Share Posted December 14, 2008 eblake, stop helping npond, he should be doing the portfolio by himself or seek his teacher's guidance. Reply Link to post Share on other sites More sharing options...
mrigankkabra Posted December 14, 2008 Report Share Posted December 14, 2008 i only did the fishing rods one.. and I did not like that much. For one criteria, where you have to suggest if u can use it in another situation, you just CANNOT think of one... and very few people scored high on this compared to how they scored on the type 1 portfolios. i did not do the BMI one, so cant say anything about that. Reply Link to post Share on other sites More sharing options...
npond Posted December 14, 2008 Report Share Posted December 14, 2008 i already asked my teacher about the regression but couldn't remember what she said. sorry. and about the sine thing, some people are using cos, some sine, i just wanted to compare, but i guess now that i understand how to use the regression, i won't have to compare. on the sheet it says you have "to find the BMI data of [b]females[/b] from another country." thanks so much for your time. Reply Link to post Share on other sites More sharing options...
roro Posted December 21, 2008 Report Share Posted December 21, 2008 In my opinion BMI is much better. I did not like fishing rod very much. BMI will help u with further studies of mathematics. Reply Link to post Share on other sites More sharing options...
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