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Math Help - linear graph theory

  1. #1
    mat
    mat is offline
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    linear graph theory

    data provided the height of a child over time
    • Age months 11,12,14.5,17,25.5,30,36,48,60,72,84,108
    • heiught cm 71.5,72,74,81,86,90,93.6,102.6,108,114.3,119.4,130 .8
    Questions
    draw a scatter diagram with the independant variable on the horizontal axis
    draw a line of best fit through your scatter
    find the equation of your line of best fit
    write down the gradient of the line and explain this
    predict childs height when age is 120 months using excel and explain it
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  2. #2
    A riddle wrapped in an enigma
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    Are you doing this manually, or are you using a graphing calcuator?

    I never do these things manually. They take too long.

    Using a TI-84+ calculator, I got

    y=.6154154546x+68.70123287 as the equation of the line of best fit. The gradient is the coefficient of x.

    For f(120), I got 142.55109 cm for height at 120 months
    Last edited by masters; June 13th 2008 at 01:35 PM.
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