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KJ4UTS

  • one year ago

Determine whether a linear, quadratic, cubic or quartic polynomial best fits the data.

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  1. KJ4UTS
    • one year ago
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  2. KJ4UTS
    • one year ago
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    |dw:1444327099717:dw|

  3. KJ4UTS
    • one year ago
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    When I graphed in on my calculator I got this and I think that is cubic?

  4. KJ4UTS
    • one year ago
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  5. KJ4UTS
    • one year ago
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    |dw:1444327237346:dw|

  6. KJ4UTS
    • one year ago
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    This is what I got for the second problem when I graphed it on my calculator and I think its cubic also but am not sure?

  7. freckles
    • one year ago
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    It seems like a cubic would best fit the data... however this one looks more cubic http://www.wolframalpha.com/input/?i=plot+%280%2C32%29%2C%284%2C45%29%2C%288%2C36%29%2C%2812%2C31%29%2C%2816%2C24%29%2C%2820%2C29%29 then this one http://www.wolframalpha.com/input/?i=plot+points+%281965%2C98%29%2C%281970%2C86%29%2C%281975%2C58%29%2C%281980%2C24%29%2C%281985%2C34%29%2C%281990%2C46%29 a quadratic might even do for this graph

  8. freckles
    • one year ago
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    is there any methods you look at besides just plotting points?

  9. KJ4UTS
    • one year ago
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    No is there other methods to determine what they are?

  10. KJ4UTS
    • one year ago
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    |dw:1444328445790:dw|

  11. freckles
    • one year ago
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    well there is polynomial least squares thingy http://www.wolframalpha.com/input/?i=least+squares+%281965%2C98%29%2C%281970%2C86%29%2C%281975%2C58%29%2C%281980%2C24%29%2C%281985%2C34%29%2C%281990%2C46%29 this method come up with a 4th deg polynomial

  12. freckles
    • one year ago
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    wait no sorry misread

  13. freckles
    • one year ago
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    it look like it come up with three options for best fit

  14. freckles
    • one year ago
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    either a quartic or cubic or a quadratic for that one

  15. KJ4UTS
    • one year ago
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    I thought quadratic was like what I drew above?

  16. freckles
    • one year ago
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    it could also be upside down

  17. freckles
    • one year ago
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    hey

  18. freckles
    • one year ago
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    look at the graphs in that picture

  19. freckles
    • one year ago
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    against the points we were to plot

  20. freckles
    • one year ago
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    it likes the blue curve is closest

  21. freckles
    • one year ago
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    which is the quartic

  22. KJ4UTS
    • one year ago
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    So the first one is cubic and the second one quartic?

  23. freckles
    • one year ago
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    both according to the graphs there are quartic though for that one cubic is a close second if you try the same coding I typed in earlier into wolfram though you should probably use the methods that were talked about in your class whatever methods those were

  24. freckles
    • one year ago
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    is it just plotting points a method in your class? or are there others?

  25. KJ4UTS
    • one year ago
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    I learning about polynomial regression this unit and we primarily use the ti-84 for this which is what I was shown

  26. freckles
    • one year ago
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    if you guys are just plotting points, it seems very opinion like to me... |dw:1444329367542:dw| because to me this kinda makes me think of quadratic

  27. freckles
    • one year ago
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    |dw:1444329423580:dw|

  28. freckles
    • one year ago
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    but if we wanted to get a better graph we would go with the quartic

  29. freckles
    • one year ago
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    to best fit the points

  30. freckles
    • one year ago
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    @Loser66 what do you think

  31. freckles
    • one year ago
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    |dw:1444329561722:dw| I would agree this makes me think of a cubic because of ...

  32. freckles
    • one year ago
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    |dw:1444329593289:dw|

  33. freckles
    • one year ago
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    but like I said quartic would be even better as the graphs in wolfram suggested

  34. KJ4UTS
    • one year ago
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    @freckles so you think that the first one is cubic like I thought but what do you think the second one is?

  35. freckles
    • one year ago
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    I thought the first one look like this: |dw:1444329869071:dw| and the second one look like this: |dw:1444329880021:dw|

  36. freckles
    • one year ago
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    the first one reminds me of a cubic and the second one reminds of a quadratic

  37. freckles
    • one year ago
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    but I could be wrong

  38. KJ4UTS
    • one year ago
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    Ok thanks, my drawings at the top did not exactly represent what I got on my calculator it was just a general sketch.

  39. freckles
    • one year ago
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    I don't like the these two questions if you couldn't tell

  40. KJ4UTS
    • one year ago
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    Yeah I could tell lol me neither

  41. freckles
    • one year ago
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    It seems to be opinion based if you guys are really just plotting points as a method

  42. freckles
    • one year ago
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    I mean we definitely wouldn't say a line

  43. KJ4UTS
    • one year ago
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    Yeah that's for sure its just been confusing to me

  44. freckles
    • one year ago
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    good luck let me know if you get the questions right

  45. KJ4UTS
    • one year ago
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    ok thanks

  46. KJ4UTS
    • one year ago
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    @peachpi what do you think

  47. freckles
    • one year ago
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    or @ganeshie8

  48. anonymous
    • one year ago
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    I agree with @freckles the first one looks cubic, the second looks quadratic

  49. KJ4UTS
    • one year ago
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    Ok thank you :)

  50. KJ4UTS
    • one year ago
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    @freckles The first one is cubic but the second one was not quadratic do you think it was quartic?

  51. freckles
    • one year ago
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    do you think my guess is really going to be better than yours? :p

  52. freckles
    • one year ago
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    maybe you were right to think they were both cubics in the beginning that was your first guess sometimes are first guess is the right guess

  53. KJ4UTS
    • one year ago
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    oh ok maybe but I thank you for taking the time to help me :)

  54. freckles
    • one year ago
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    i'm sorry I wasn't better at the guessing part :p

  55. freckles
    • one year ago
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    @IrishBoy123

  56. freckles
    • one year ago
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    |dw:1444331902570:dw| they were suppose to plot points I thought the polynomial that best fit this was a quadratic what do you think? (also quadratic was marked wrong)

  57. freckles
    • one year ago
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    they had other options like linear, cubic, quartic, none of these we already can throw out linear so it is either cubic or quartic or neither

  58. KJ4UTS
    • one year ago
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    I was looking at some other graphs and it looks like it could very well be quartic is that what wolf math said?

  59. freckles
    • one year ago
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    well wolfram said that quartric would be a good fit for both so it makes me worry since that one question accepted cubic

  60. KJ4UTS
    • one year ago
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    I see what you mean, this question is such a nightmare lol

  61. freckles
    • one year ago
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    quartic is my final guess I'm done it could be wrong just so you know

  62. freckles
    • one year ago
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    well hey before you click it

  63. freckles
    • one year ago
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    lol so you are just suppose to put those points in the calculator and that is it right?

  64. freckles
    • one year ago
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    like you don't have to click in other things just look at the graph right?

  65. KJ4UTS
    • one year ago
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    pretty much

  66. freckles
    • one year ago
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    well that sucks

  67. KJ4UTS
    • one year ago
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    Yeah I will let you know I have two more times to answer this

  68. KJ4UTS
    • one year ago
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    or to re answer I should say and if its not quartic we will try cubic and get to the bottom of this :)

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