# Math SL BMI or fishing rods?

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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?

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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.

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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?

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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!

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[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 by eblake

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eblake, stop helping npond, he should be doing the portfolio by himself or seek his teacher's guidance.

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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.

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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.

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In my opinion BMI is much better. I did not like fishing rod very much. BMI will help u with further studies of mathematics.

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