A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • one year ago

The graph below shows the relationship between the number of months different students practiced baseball and the number of games they won: Part A: What is the approximate y-intercept of the line of best fit and what does it represent? (5 points) Part B: Write the equation for the line of best fit in slope-intercept form and use it to predict the number of games that could be won after 13 months of practice. (5 points)

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

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

    any help would be appreciated

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

    @Nnesha @Astrophysics

  4. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    do you see what the y-intercept is?

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

    well i know that the y-intercept is the place where a line crosses the y-axis

  6. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    which is where in this case?

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

    is it the second dot ? ike 0,1?

  8. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    focus on the line and not the dot. The dot is a bit below the line

  9. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    So it's probably around (0,1.5) maybe

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

    so what do i do?

  11. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    do you agree that the y-intercept is around (0,1.5) ?

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

    well i said 1 so why is it 1.5?

  13. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    I zoomed in and saw that the point at (0,1) is slightly below the place where the line crosses the y axis

  14. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1438992422113:dw|

  15. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1438992436303:dw|

  16. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1438992467887:dw|

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

    oh alright i see now

  18. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    what does it represent?

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

    the numbers of games they won?

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

    is that what it means

  21. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    what is the line of best fit trying to do?

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

    i dont know ...

  23. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    we have a bunch of points and the line of best fit is trying to get as close as possible to each point, right?

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

    yeah

  25. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    the line of best fit is a tool used to predict y scores based on given x values if we know the number of months practiced, then we can use it to predict the number of games one based on the regression line

  26. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    what is the x value at the y-intercept?

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

    0

  28. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    when the number of months of practice is 0, the predicted number of games won would be around 1.5 that's what the y-intercept tells us

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

    thanks i know ive been hard work haha could you help me with the other part

  30. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    you'll first need to write down all of the points shown on the graph make one big list of points

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

    alright

  32. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    once you have your list, paste it into http://www.alcula.com/calculators/statistics/linear-regression/ to calculate the regression line

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

    this will give me the equation?

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

    ok i filled it in

  35. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    yeah it should be calculated/shown after you hit the "submit data" button

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

    it just shows the graph ?

  37. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    I think the equation is shown above the graph

  38. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    above where it says "Regression line equation:"

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

    /.Sample size: 10 Mean x (x̄): 4.8 Mean y (ȳ): 10.85 Intercept (a): 1.9772727272727 Slope (b): 1.8484848484848 Regression line equation: y=1.9772727272727+1.8484848484848x

  40. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    so y=1.9772727272727+1.8484848484848x

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

    thats the equation ?

  42. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    I was pretty close. 1.97 is close to 1.5 well closer to 2 actually

  43. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    yeah

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

    so do i change part a to 1.97

  45. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    no that was an estimate based on just looking at the graph

  46. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    it doesn't have to be perfect

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

    oh alright thanks bunches

  48. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    no problem

  49. 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.