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anonymous

  • one year ago

Whats the regression equation??? Height: 115, 124, 75, 75, 130, 74, 98, 87 Interval after min: 84, 78, 65, 69, 81, 72, 65, 66 Current eruption has a height of 92ft Use the significance level of 0.05. ŷ = ( ) + ( )x

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  1. amistre64
    • one year ago
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    looks like a prime candidate for the ti83

  2. amistre64
    • one year ago
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    but then im not sure what the last line means for this

  3. amistre64
    • one year ago
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    input your values into list 1 and list 2 there is a function on your ti83 that will then give you the regression line.

  4. amistre64
    • one year ago
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    otherwise, it gets complicated, but excel or some spreadsheet makes life simpler for us

  5. anonymous
    • one year ago
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    ok I am trying now

  6. anonymous
    • one year ago
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    I cant get it

  7. anonymous
    • one year ago
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    This is my last question that I am having issues with

  8. amistre64
    • one year ago
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    yeah, its a bit complicated, but listing them is the key .... by hand, we would need to know more complicated results sum of x^2 sum of y^2 sum of xy sum of x sum of y average x average y and number of ordered pairs.

  9. anonymous
    • one year ago
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    I tried but I am getting the wrong data input

  10. anonymous
    • one year ago
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    Please please help me on this one

  11. amistre64
    • one year ago
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    ive got a spread sheet worked out hold on

  12. anonymous
    • one year ago
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    Thank you so much!!!

  13. amistre64
    • one year ago
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    ok, this is what im getting, and ill explain it

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  14. anonymous
    • one year ago
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    Okay thank you bc that looks confusing lol

  15. amistre64
    • one year ago
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    we want to utilize the point slope formula, our point (avgX, avgY) and a slope that is determined by the formula: \[m=\frac{n\sum xy-\sum x\sum y}{n\sum xx-\sum x\sum x}\] as such: \[\hat y=avgY+m(x-avgX)\] \[\hat y=avgY-m.avgX~+mx\] i used the spreadsheet to make all these calculations m = 2.356 avgY-m.avgX = 268.040

  16. amistre64
    • one year ago
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    now i dont know what your program is wanting as far as how many decimal places to rnd to

  17. amistre64
    • one year ago
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    i cut it off at 3 decimals

  18. amistre64
    • one year ago
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    and I have no idea what this is refering to: Use the significance level of 0.05

  19. anonymous
    • one year ago
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    So, it should then say ŷ = (2.356 ) + ( 268.04)x

  20. amistre64
    • one year ago
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    that is what i would use for it, but again, i dont know what your course uses as a rnding of decimals. I used 3 places.

  21. anonymous
    • one year ago
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    it says two decimal places

  22. amistre64
    • one year ago
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    ŷ = (avgY-m.avgX ) + (m)x ŷ = (268.04 ) + ( 2.36)x

  23. anonymous
    • one year ago
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    Ugh it said it wasn't right

  24. amistre64
    • one year ago
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    the equation itself is all i can answer to, the rest of it ... i havent a clue about.

  25. anonymous
    • one year ago
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    did you find the best predicted value?

  26. amistre64
    • one year ago
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    y^ is the best predictor

  27. amistre64
    • one year ago
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    when we formulate the regression line, we then use it for x=96

  28. amistre64
    • one year ago
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    well, 92 in this case

  29. amistre64
    • one year ago
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    if i had excel, it would allow me to verify the line, but i have something else on this computer ... guess i can use a website

  30. anonymous
    • one year ago
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    ŷ = (47.87 ) + ( 0.25)x what about from this?

  31. amistre64
    • one year ago
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    ok, an online calculator says ive got an error in the y intercept slope is fine tho

  32. amistre64
    • one year ago
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    got it now, i erred in multiplyng :) y = m(x-X) + Y y = mx -mX + Y ^^^^ i ignored the negative of it

  33. amistre64
    • one year ago
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    this is the correction y = 2.36x - 73.54

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