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brandonw998

  • one year ago

Help with regression lines

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  1. brandonw998
    • one year ago
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  2. brandonw998
    • one year ago
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    I can't figure out how to get the Predicted cost part

  3. jim_thompson5910
    • one year ago
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    how did you find 0.08 in that last box?

  4. brandonw998
    • one year ago
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    I have done the question like 6 times and it's always 0.08

  5. jim_thompson5910
    • one year ago
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    what kind of calculator do you have?

  6. brandonw998
    • one year ago
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    TI-84 Plus CE

  7. brandonw998
    • one year ago
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    I enter in the data in L1 and L2 but can never get the answer they get

  8. jim_thompson5910
    • one year ago
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    idk what the CE means, but I have a TI84 plus, so I guess that works

  9. jim_thompson5910
    • one year ago
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    so you have your data into L1 and L2 did you do a LinReg ?

  10. brandonw998
    • one year ago
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    Yes

  11. jim_thompson5910
    • one year ago
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    ok it should say something like ax+b or a+bx and then spit out what a and b are

  12. brandonw998
    • one year ago
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    b=-467.213 but the answer is always between like 164 to 166

  13. jim_thompson5910
    • one year ago
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    hmm let me try, one sec

  14. brandonw998
    • one year ago
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    I guess what's the predicted cost when the miles is at 0.08?

  15. jim_thompson5910
    • one year ago
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    ok I'm getting 0.08 now

  16. jim_thompson5910
    • one year ago
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    and I'm not getting a number between 164 and 167 but I'm getting pretty close to it

  17. brandonw998
    • one year ago
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    How did you get 0.08?

  18. jim_thompson5910
    • one year ago
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    well I got 0.07877 approx which rounds to 0.08

  19. brandonw998
    • one year ago
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    How?

  20. brandonw998
    • one year ago
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    In LinReg?

  21. jim_thompson5910
    • one year ago
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    yeah using that function

  22. brandonw998
    • one year ago
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    I don't see it in mine :(

  23. jim_thompson5910
    • one year ago
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    it's in the calc menu after you hit the stat key

  24. brandonw998
    • one year ago
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    Calc 4?

  25. jim_thompson5910
    • one year ago
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    yeah

  26. jim_thompson5910
    • one year ago
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    btw make sure your "miles" is in the L1 column

  27. jim_thompson5910
    • one year ago
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    if you put "miles" in the L2 column, you'll have to type in `LinReg(ax+b) L2,L1`

  28. brandonw998
    • one year ago
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    Ohh really? I've been putting it in L2 that must be the problem

  29. brandonw998
    • one year ago
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    Why must the miles go first?

  30. brandonw998
    • one year ago
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    Now I got it a=0.07877

  31. brandonw998
    • one year ago
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    and b is 162.95

  32. jim_thompson5910
    • one year ago
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    because the equation is cost = ____ + ____ * (miles) miles is the input

  33. brandonw998
    • one year ago
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    Oh I see so I was doing it backwards

  34. jim_thompson5910
    • one year ago
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    well they put the columns in the wrong order (probably to throw you off)

  35. brandonw998
    • one year ago
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    So Predicted cost should be 162.96?

  36. brandonw998
    • one year ago
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    162.95

  37. brandonw998
    • one year ago
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    I actually have to do this problem again since I already restarted it

  38. jim_thompson5910
    • one year ago
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    no that value goes in the missing box

  39. brandonw998
    • one year ago
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    Oh right

  40. brandonw998
    • one year ago
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    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!

  41. jim_thompson5910
    • one year ago
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    yeah I made the same mistake but swapping the columns or entering `LinReg(ax+b) L2,L1` addresses the issue

  42. brandonw998
    • one year ago
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    Oh okay

  43. brandonw998
    • one year ago
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    Thank you :D

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