for the following set of data find an appropriate regression equation (linear, exponential, or logarithmic) state your reason x: 1,2,3,4,5 y: 112,114, 119, 122, 129

- anonymous

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- anonymous

ok so look at the y values
you go from +2, +5, +3, +7, etc...what type of pattern do you think it is?

- anonymous

i mean you go from 112 to 114 by adding 2 etc

- anonymous

im not sure i dont know how to do this problem

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- anonymous

ok well i would define it as a piecewise function
actually hold on.........hmmmm let me think about this

- anonymous

were looking for a regression equation such as exponential linear or logarithmic

- anonymous

yeah i know...i was just seeing if you could possibly use two different ones and define them only for when x is odd and another for when x is even...

- anonymous

yeah i thought it was exponential and linear but i'm not sure..

- anonymous

its definitely not log

- anonymous

did you plug it in your calculator?

- anonymous

yeah buts its not regression

- anonymous

why not ?

- anonymous

idk..its not perfect linear...

- anonymous

so now what

- anonymous

?

- anonymous

i would just say linear because there is no way to fit it to log or exp

- anonymous

how do you put this in the calculator i don't know how to

- anonymous

what calculator do you have?

- anonymous

ti-83

- anonymous

ok so turn it on
go to stat
go to edit
you'll see like L1, L2, etc
in L1 put in your x values and in L2 put the y values
then quit
do 2nd, Y=
go to 1:
go On
then go zoom, go zoomfit

- anonymous

make sure in Y= that the plot1 is highlighted

- anonymous

ok now what

- anonymous

just go graph

- anonymous

its just points plotted..

- anonymous

haha i know now you can fit the graph

- anonymous

how?

- anonymous

ok so you want to go stat
go to calc
go to linreg(ax+b)
then put L1, L2 after in the main screen

- anonymous

what do u mean main screen

- anonymous

the main screen is where you do all the math...like would do cos(30), 5+1, sqrt(9)...

- anonymous

when you click lin reg(ax+b) it will take you to the main screen

- anonymous

well after i hit lin reg then what

- anonymous

press 2nd 1 , 2nd 2 enter
you get a linear regression y = 4.2x + 106.6

- anonymous

no i got 4x+ 107.4

- anonymous

did you enter it right? hmm........
press 2nd 0
scroll to
actually no...that should not be correct

- anonymous

its close enough :)

- anonymous

okk what do i do now..

- anonymous

justify its linear...haha what stat is this for?

- anonymous

noo but shouldnt there be a line going through those points ?

- anonymous

yeah but look at the graph...
do you know the concept of a floor? its like the greatest integer function...and then add like one to it...that should make it approximate. idk unless it has to be regression....then you could try exponential shifted way up...but its the 4th term that makes me question that possibility...

- anonymous

do i plug the linear regression into y=?

- anonymous

yeah the equation is supposed to be an approximate for the data

- anonymous

but both the linear regression and exponential equations lie in the same place?

- anonymous

...what?

- anonymous

when i plug the linear regression equation into the y= i end up with a line going across the graph and then when i plug in the exponential regression into the y= the line lays in the same place as the linear regression equation line

- anonymous

is your data correct?
idk but i gotta go so when is this due? monday? i can try to help you tomorrow or something...

- anonymous

yea i put 113 instead of 112

- anonymous

107.1678132(1.035666278^x) is tht the expreg?

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