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Math Help - Natural Logarithm Regression Equation

  1. #1
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    Natural Logarithm Regression Equation

    The table gives Sweden's nuclear power generation data in billions of kilowatt-hours. Let x = 5 represent 1980, x = 10 represent 1985, and so on.

    Year|1980|1985|1990|1995|
    Energy produced |25.3|55.8|65.2|66.5|

    (a) Find a natural logarithm regression equation for the data.

    (b) Predict when Sweden's nuclear power generation will reach 85 billion kilowatt-hours.

    Ok, so in my calculator i have (I think) found the ln regression equation, which is Y= a+blnx
    a= -20.9
    b= 30.8
    r^2= .93
    r= .97

    So the equation should be -20.9 + 30.8lnx correct?

    and to predict for (b), I need to make a graph of the data, but I am unsure on how to do that, could someone help please?
    Thanks a bunch!
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  2. #2
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    Quote Originally Posted by Wesker View Post
    The table gives Sweden's nuclear power generation data in billions of kilowatt-hours. Let x = 5 represent 1980, x = 10 represent 1985, and so on.

    Year|1980|1985|1990|1995|
    Energy produced |25.3|55.8|65.2|66.5|

    (a) Find a natural logarithm regression equation for the data.

    (b) Predict when Sweden's nuclear power generation will reach 85 billion kilowatt-hours.

    Ok, so in my calculator i have (I think) found the ln regression equation, which is Y= a+blnx
    a= -20.9
    b= 30.8
    r^2= .93
    r= .97

    So the equation should be -20.9 + 30.8lnx correct?

    and to predict for (b), I need to make a graph of the data, but I am unsure on how to do that, could someone help please?
    Thanks a bunch!
    see the following thread ...

    http://www.mathhelpforum.com/math-he...-equation.html
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