KJ4UTS
  • KJ4UTS
Determine whether a linear, quadratic, cubic or quartic polynomial best fits the data.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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KJ4UTS
  • KJ4UTS
KJ4UTS
  • KJ4UTS
|dw:1444327099717:dw|
KJ4UTS
  • KJ4UTS
When I graphed in on my calculator I got this and I think that is cubic?

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KJ4UTS
  • KJ4UTS
KJ4UTS
  • KJ4UTS
|dw:1444327237346:dw|
KJ4UTS
  • KJ4UTS
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?
freckles
  • freckles
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
freckles
  • freckles
is there any methods you look at besides just plotting points?
KJ4UTS
  • KJ4UTS
No is there other methods to determine what they are?
KJ4UTS
  • KJ4UTS
|dw:1444328445790:dw|
freckles
  • freckles
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
freckles
  • freckles
wait no sorry misread
freckles
  • freckles
it look like it come up with three options for best fit
freckles
  • freckles
either a quartic or cubic or a quadratic for that one
KJ4UTS
  • KJ4UTS
I thought quadratic was like what I drew above?
freckles
  • freckles
it could also be upside down
freckles
  • freckles
hey
freckles
  • freckles
look at the graphs in that picture
freckles
  • freckles
against the points we were to plot
freckles
  • freckles
it likes the blue curve is closest
freckles
  • freckles
which is the quartic
KJ4UTS
  • KJ4UTS
So the first one is cubic and the second one quartic?
freckles
  • freckles
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
freckles
  • freckles
is it just plotting points a method in your class? or are there others?
KJ4UTS
  • KJ4UTS
I learning about polynomial regression this unit and we primarily use the ti-84 for this which is what I was shown
freckles
  • freckles
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
freckles
  • freckles
|dw:1444329423580:dw|
freckles
  • freckles
but if we wanted to get a better graph we would go with the quartic
freckles
  • freckles
to best fit the points
freckles
  • freckles
@Loser66 what do you think
freckles
  • freckles
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 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 we are just suppose to plot these points and just guess what graph best fits (we don't need least squares method or whatever)
freckles
  • freckles
|dw:1444329561722:dw| I would agree this makes me think of a cubic because of ...
freckles
  • freckles
|dw:1444329593289:dw|
freckles
  • freckles
but like I said quartic would be even better as the graphs in wolfram suggested
KJ4UTS
  • KJ4UTS
@freckles so you think that the first one is cubic like I thought but what do you think the second one is?
freckles
  • freckles
I thought the first one look like this: |dw:1444329869071:dw| and the second one look like this: |dw:1444329880021:dw|
freckles
  • freckles
the first one reminds me of a cubic and the second one reminds of a quadratic
freckles
  • freckles
but I could be wrong
KJ4UTS
  • KJ4UTS
Ok thanks, my drawings at the top did not exactly represent what I got on my calculator it was just a general sketch.
freckles
  • freckles
I don't like the these two questions if you couldn't tell
KJ4UTS
  • KJ4UTS
Yeah I could tell lol me neither
freckles
  • freckles
It seems to be opinion based if you guys are really just plotting points as a method
freckles
  • freckles
I mean we definitely wouldn't say a line
KJ4UTS
  • KJ4UTS
Yeah that's for sure its just been confusing to me
freckles
  • freckles
good luck let me know if you get the questions right
KJ4UTS
  • KJ4UTS
ok thanks
KJ4UTS
  • KJ4UTS
@peachpi what do you think
freckles
  • freckles
or @ganeshie8
anonymous
  • anonymous
I agree with @freckles the first one looks cubic, the second looks quadratic
KJ4UTS
  • KJ4UTS
Ok thank you :)
KJ4UTS
  • KJ4UTS
@freckles The first one is cubic but the second one was not quadratic do you think it was quartic?
freckles
  • freckles
do you think my guess is really going to be better than yours? :p
freckles
  • freckles
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
KJ4UTS
  • KJ4UTS
oh ok maybe but I thank you for taking the time to help me :)
freckles
  • freckles
i'm sorry I wasn't better at the guessing part :p
freckles
  • freckles
@IrishBoy123
freckles
  • freckles
|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)
freckles
  • freckles
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
KJ4UTS
  • KJ4UTS
I was looking at some other graphs and it looks like it could very well be quartic is that what wolf math said?
freckles
  • freckles
well wolfram said that quartric would be a good fit for both so it makes me worry since that one question accepted cubic
KJ4UTS
  • KJ4UTS
I see what you mean, this question is such a nightmare lol
freckles
  • freckles
quartic is my final guess I'm done it could be wrong just so you know
freckles
  • freckles
well hey before you click it
freckles
  • freckles
lol so you are just suppose to put those points in the calculator and that is it right?
freckles
  • freckles
like you don't have to click in other things just look at the graph right?
KJ4UTS
  • KJ4UTS
pretty much
freckles
  • freckles
well that sucks
KJ4UTS
  • KJ4UTS
Yeah I will let you know I have two more times to answer this
KJ4UTS
  • KJ4UTS
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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