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Math Help - need help with grade 12 data management

  1. #1
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    Exclamation need help with grade 12 data management

    Hi. I have two questions"

    1) Given the following coefficients of correlation, state what percent of variation in y is due to the variation in x.

    A) r=0.41 b)r=-0.93 c)r=-1.0

    How would I do a question like this?

    and...

    2) given the chart:



    find the equation of the line of best fit. How did you do this?

    *I have no clue how to find the equation. I am so confused.

    Thanks in advance for any help, I greatly appreciate it.

    Jenn
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  2. #2
    Newbie JohnM's Avatar
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    Quote Originally Posted by jenneedshelp View Post
    Hi. I have two questions"

    1) Given the following coefficients of correlation, state what percent of variation in y is due to the variation in x.

    A) r=0.41 b)r=-0.93 c)r=-1.0

    How would I do a question like this?

    and...

    2) given the chart:



    find the equation of the line of best fit. How did you do this?

    *I have no clue how to find the equation. I am so confused.

    Thanks in advance for any help, I greatly appreciate it.

    Jenn

    1)
    If you square each correlation coefficient, you'll get r^2 - the coefficient of determination, which is the percentage of the variation in y due to the variation in x.

    2)
    the equation of any linear best fit line is the form y = mx + b where m is the slope and b is the y-intercept (value of y when x=0)

    the following link shows you the equations for finding m and b from data - go down approx 1/3 of the page:

    Regression: Fitting Functions to Data
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