Equation of the best fit line - Bivariate Data

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Equation of the best fit line

Lessons

Notes:
The best fit line has the equation: y=ax+by=ax+b, where aa and bb are given as:
a=nxyxynx2(x)2a=\frac{n\sum xy-\sum x \sum y}{n\sum x^2-(\sum x)^2}
b=yaxb=\overline{y}-a\overline{x}
  • 3.
    Determining the Equation for a Best Fit Line using Calculator Commands
    For the following bivariate data:

    x

    y

    1

    9

    2

    7

    3

    8

    4

    5

    5

    5

    6

    3

    7

    2


  • 4.
    Interpretation graphical Data
    In Skyrim (a video game) I plotted what level I was when I killed my first 5 dragons. The graphical data is given below:

    # of dragons killed

    Corresponding level

    1

    Level 4

    2

    Level 5

    3

    Level 6

    4

    Level 6

    5

    Level 7


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Equation of the best fit line

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