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anonymous

  • one year ago

scatter plot help???

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  1. anonymous
    • one year ago
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    Sure, what's the Q? :)

  2. anonymous
    • one year ago
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    http://gyazo.com/9d7806cc31865f7ac997e0f53c9e42e4 the scatter plot, http://gyazo.com/6934b7547dd1e72ac93cbbcb55d6cf22 the question.

  3. welshfella
    • one year ago
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    The observed values are the actual dots on the graph while the predicted values are the corresponding point on the line. The residual is the difference between these 2 values.

  4. anonymous
    • one year ago
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    so how would i do it

  5. welshfella
    • one year ago
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    Read the values off the graph what is the plotted point for monthly heating cost for 25.4 degrees?

  6. anonymous
    • one year ago
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    51.00

  7. welshfella
    • one year ago
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    right - its on the table as well as the graph now you cant read the cost accurately from the line so use the equation

  8. anonymous
    • one year ago
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    but with the equation im confused. wht am i supposed to finding from the eqaution?

  9. welshfella
    • one year ago
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    monthly cost y = -1.1 x + 90.51 replace x by 25.4 and calculate y

  10. anonymous
    • one year ago
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    62.57

  11. welshfella
    • one year ago
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    y = -1.1 * 25.4 + 90.51 it should come to approximately 62

  12. welshfella
    • one year ago
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    - right that was fast

  13. anonymous
    • one year ago
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    should i put 62 or 62.57

  14. welshfella
    • one year ago
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    put 62.57

  15. anonymous
    • one year ago
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    okay i did that

  16. welshfella
    • one year ago
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    now the residual is the difference to be honest i'm not sure which one is subtracted - I think its 62.57 - 51.00

  17. anonymous
    • one year ago
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    okay 11.57

  18. welshfella
    • one year ago
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    yes

  19. welshfella
    • one year ago
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    - the cost was less than expected so that's 11.57 in your pocket - right?

  20. anonymous
    • one year ago
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    yeah. so i did the same for the bottom question

  21. anonymous
    • one year ago
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    would you mind helping me with another?

  22. welshfella
    • one year ago
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    ok but i have to go in 10 minuets

  23. anonymous
    • one year ago
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    ok illl post it fast

  24. welshfella
    • one year ago
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    predicted score for no time studying is y = 3.83(0) + 15,68

  25. anonymous
    • one year ago
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    so 15.68?

  26. welshfella
    • one year ago
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    for 1 hour of study y = 3.83 + 15.68 answer = this value - value for no stusying

  27. welshfella
    • one year ago
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    for 12 hours of study y = 3.83(12) + 15.68

  28. anonymous
    • one year ago
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    so my answers are 15.68 3.84 and 61.65

  29. welshfella
    • one year ago
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    second one is 3.83 yes

  30. welshfella
    • one year ago
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    - other 2 are right

  31. welshfella
    • one year ago
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    gotta go now hoped you have learned something

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