brandonw998
  • brandonw998
Help with regression lines
Mathematics
katieb
  • katieb
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brandonw998
  • brandonw998
1 Attachment
brandonw998
  • brandonw998
I can't figure out how to get the Predicted cost part
jim_thompson5910
  • jim_thompson5910
how did you find 0.08 in that last box?

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brandonw998
  • brandonw998
I have done the question like 6 times and it's always 0.08
jim_thompson5910
  • jim_thompson5910
what kind of calculator do you have?
brandonw998
  • brandonw998
TI-84 Plus CE
brandonw998
  • brandonw998
I enter in the data in L1 and L2 but can never get the answer they get
jim_thompson5910
  • jim_thompson5910
idk what the CE means, but I have a TI84 plus, so I guess that works
jim_thompson5910
  • jim_thompson5910
so you have your data into L1 and L2 did you do a LinReg ?
brandonw998
  • brandonw998
Yes
jim_thompson5910
  • jim_thompson5910
ok it should say something like ax+b or a+bx and then spit out what a and b are
brandonw998
  • brandonw998
b=-467.213 but the answer is always between like 164 to 166
jim_thompson5910
  • jim_thompson5910
hmm let me try, one sec
brandonw998
  • brandonw998
I guess what's the predicted cost when the miles is at 0.08?
jim_thompson5910
  • jim_thompson5910
ok I'm getting 0.08 now
jim_thompson5910
  • jim_thompson5910
and I'm not getting a number between 164 and 167 but I'm getting pretty close to it
brandonw998
  • brandonw998
How did you get 0.08?
jim_thompson5910
  • jim_thompson5910
well I got 0.07877 approx which rounds to 0.08
brandonw998
  • brandonw998
How?
brandonw998
  • brandonw998
In LinReg?
jim_thompson5910
  • jim_thompson5910
yeah using that function
brandonw998
  • brandonw998
I don't see it in mine :(
jim_thompson5910
  • jim_thompson5910
it's in the calc menu after you hit the stat key
brandonw998
  • brandonw998
Calc 4?
jim_thompson5910
  • jim_thompson5910
yeah
jim_thompson5910
  • jim_thompson5910
btw make sure your "miles" is in the L1 column
jim_thompson5910
  • jim_thompson5910
if you put "miles" in the L2 column, you'll have to type in `LinReg(ax+b) L2,L1`
brandonw998
  • brandonw998
Ohh really? I've been putting it in L2 that must be the problem
brandonw998
  • brandonw998
Why must the miles go first?
brandonw998
  • brandonw998
Now I got it a=0.07877
brandonw998
  • brandonw998
and b is 162.95
jim_thompson5910
  • jim_thompson5910
because the equation is cost = ____ + ____ * (miles) miles is the input
brandonw998
  • brandonw998
Oh I see so I was doing it backwards
jim_thompson5910
  • jim_thompson5910
well they put the columns in the wrong order (probably to throw you off)
brandonw998
  • brandonw998
So Predicted cost should be 162.96?
brandonw998
  • brandonw998
162.95
brandonw998
  • brandonw998
I actually have to do this problem again since I already restarted it
jim_thompson5910
  • jim_thompson5910
no that value goes in the missing box
brandonw998
  • brandonw998
Oh right
brandonw998
  • brandonw998
Thanks man! I guess I was getting it wrong because I was entering in L1 and L2 backwards. I have been so confused for over an hour. Thank you!
jim_thompson5910
  • jim_thompson5910
yeah I made the same mistake but swapping the columns or entering `LinReg(ax+b) L2,L1` addresses the issue
brandonw998
  • brandonw998
Oh okay
brandonw998
  • brandonw998
Thank you :D

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