A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • one year ago

Please I really need help Can someone help me if I type it all out? Posts longer than 2 sentences on here seem to scare people on here, but I will fan and medal.

  • This Question is Closed
  1. arindameducationusc
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    which data?

  2. arindameducationusc
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    regression, never tried. But I am good with equations and straight lines I will try

  3. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I am going to type it, I seem to keep scaring people off with my table and work.

  4. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I'm just going to lay it all out okay?

  5. arindameducationusc
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    haha

  6. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    that's all my work

  7. arindameducationusc
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    okay.... I will try okay.. I cant guarantee, but I will do my best

  8. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    thank you so much it means so much to me. I am so stressed about this

  9. arindameducationusc
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Are you taking x as 'avrge weekly paycheck'?

  10. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yes

  11. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    @peachpi can you help at all?

  12. arindameducationusc
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Rate of change are absolutely correct, ya but the graph...!! hmmm... let me think.....

  13. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    the line regression has to be least squares or line of best-fit

  14. arindameducationusc
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    @lostinrome Is your cell phone android... I can give you a name of a software which deals with regressions

  15. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I'm on my laptop right now

  16. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ^ I was just going to ask if this has to be done by hand. Excel does linear regression

  17. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yeah I have to come up with an equation (this whole thing is all on paper)

  18. arindameducationusc
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I graphed it in my mobile, should I send you the screen shot?

  19. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I'm not sure where to even start the linear regression and how I get an equation from it

  20. arindameducationusc
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    equation I am getting -1.951402x+1040.6445224

  21. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I haven't done this in years. I'm looking some equations up

  22. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I don't have excel on my laptop so I can't use that

  23. arindameducationusc
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    @phi is a very helpful person. He will help once he is online, just keep the question open

  24. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    this is bad I really don't know what to do and I'm like freaking out

  25. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    when does @phi come on usually?

  26. arindameducationusc
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Don't know actually, but he will help. He has helped me a lot in my complicated problems!

  27. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Fill in the table. In the third column, square the x values. In the fourth, multiply x and y. Add up the numbers in each column for the box at the bottom |dw:1440211191451:dw|

  28. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    okay let me see

  29. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yes

  30. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Once we have the table filled in these are the formulas we're going to use to write the line in y = ax + b format |dw:1440211851554:dw|

  31. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    i'm still typing in the table so give me a sec

  32. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    |dw:1440211921215:dw|

  33. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    okay now to write the line in y = ax + b format

  34. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so how do we apply the table to those formulas

  35. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I've seen those formulas before, but have a hard time understanding them.

  36. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ok so now we're going to use the sums at the bottom of the table. To put each sum in the right place, you just need to pay attention to the x's and y's and their exponents n is the number of points, so \(n = 6\) \[\sum_{i=1}^{6}x_i=96\] \[\sum_{i=1}^{6}y_i=5695\] \[\sum_{i=1}^{6}x^2_i=1606\] \[\sum_{i=1}^{6}x_iy_i=99055\] Putting all that into the equation for a we get \[a=\frac{ 6(99055)-(96)(5695) }{ 6(1606)-(96)^2 }\]

  37. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    okay that makes sense

  38. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    a = 1587/14 ?

  39. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yes :)

  40. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    now for b \[b=\frac{ 1 }{ 6 }\left( 5695-\frac{ 1587 }{ 14 }(96) \right)\]

  41. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    At this point you might find it easier to change these to decimals and round to 2 or 3 decimal places

  42. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I'm having trouble finding the decimal for b

  43. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    b=(1/6)(5695-10882.29) =(1/6)(5187.29) = -864.55

  44. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yeah

  45. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    y = 113.35x + -864.55

  46. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    what do i do for the x in there?

  47. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    the x stays. It's part of the equation

  48. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    okay thought so. Wait was this whole thing in least squares or line of best-fit?

  49. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    least squares

  50. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    from excel |dw:1440214055244:dw|

  51. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    okay and now for my millionth question, I have to get the slope of this equation we came up with and compare to the rate of change values I did.

  52. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I'm going to try and find the slope.

  53. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    The slope is the "a" we found 113.36

  54. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    oh slope of y = 113.35x + -864.55 is 113.36? Okay

  55. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    oh, ok. it should have been rounded up to 113.36

  56. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so slope is 113.36

  57. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Yes. And for the rates of change you found above, you ended up with the right results, but the equations are backwards. For example the first one should be m= (810 - 585)/(15-13) m = 225/2 m = 112.5

  58. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Oh one more thing if you don't mind or if @arindameducationusc can pitch in if @peachpi is tired of me lol

  59. arindameducationusc
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    hehe :D

  60. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    It looks like the x's were years of schooling, so plug in 23 for x in the equation you found and solve for y

  61. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    right

  62. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    You are awesome. Thank you again!

  63. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I want to give you like 50 medals

  64. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    lol you're welcome

  65. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yeah that's the right formula. Maybe you just typed them in reverse up top, because you ended up with the right numbers at the end

  66. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Yeah looking back I think that's what happened.

  67. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ok cool

  68. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    :)

  69. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.