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    May 2012
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  1. My teacher isn't letting us use matrices for this.....HELP! I don't know how else to do it!
  2. I can't believe you! you need to use at the very least two points to model your function and your model must then pass through these two. if it doesn't, you must have made a calculation mistake. re-check your work. I can't tell you whether it'll be fine since idk how good it looks like on the data, but obviously a better fitting function will make the examiner happier and show that you're "smarter" I did use the points...but I guess it was just a calculation error. I don't get why it's not passing through, ugh. Let me try again..
  3. Just a question; Is it okay if, when creating a function to model data points, our model doesn't fit exactly? Because, to be honest, my model only goes through one point...it's pretty bad. Should I start over, or use this model as the first step in an investigation, and be like "Oh, well that didn't work, so let's try ____"?
  4. I want to use a sine function for this, but I'm not sure how to use matrices to solve it..we never learned about augmented matrices or anything, just the basics. I feel like sine is the way to go, please help!
  5. I found a gs for the denominator, but it's not giving me the right results..
  6. ...WOW I feel really dumb, I typed the equation wrong when I graphed it. So sorry! Yeah, the curve fits perfectly, thank you so much!
  7. OK SO. I'm getting a quadratic regression now but it's not passing through any of the points....is that what others got, too? EDIT: Also, should I include all my mistakes in the portfolio, as part of the process...? o_o I've made many, I'm pretty much starting over again..
  8. I used a graphing caluculator. In "L1" for stat plot I inputted 1,2,3,4 and 5 for the rows. In "L2" I inputted 0, 3, 6, 10 and 15 for the numerators. When I did this, I then tested for linear, quadratic, cubic, and quartic regressions. Cubic passed through all the points whereas quadratic didn't, so I assumed that it was cubic. However, later on when I was trying the denominator GS, I noticed that a quadratic actually ends up following the trend better than the cubic. SO did I do the regression right? And if I did, should I include my findings later on about how quadratic might work better?
  9. I don't know why/how a cubic works best for my numerator, it passes through all the points and my quadratic doesn't...so it's messing with the part where I have to find the GS for the denominator, because I've been following the method outline here, which uses a quadratic method. Should I redo everything with cubic regressions, or change my numerator GS to quadratic?
  10. Thanks for clearing that up! I was just unsure what to plot the denominators against. So the graph is basically row number and denominator? and then I quad reg? EDIT: Another question about the logistics of plotting row against denominator.. do I just keep decreasing the number of rows in the list I'm plotting since the starting row decreases each time and the number of denominators decreases, too? Does that make sense? Sorry if it doesn't. $:
  11. I actually found that a cubic regression works best for the numerator's relation with the row number...I'm still having trouble with the denominator, though, can someone please explain?
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