Equation of the best fit line  Bivariate Data
Equation of the best fit line
Lessons
Notes:
The best fit line has the equation: $y=ax+b$, where $a$ and $b$ are given as:
• $a=\frac{n\sum xy\sum x \sum y}{n\sum x^2(\sum x)^2}$
• $b=\overline{y}a\overline{x}$

2.
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

3.
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