Dependent Variable (placed on vertical axis: y). A dependent variable is a variable dependent on the value of another variable. Independent Variable (placed on horizontal axis: x). The independent variable causes an apparent change in, or affects the dependent variable. Examples:
Independent Variable(placed on horizontal axis: x)
dependent variable (y)
independent variable (x)
If the points nearly form a line, then the
correlation is ___________________.
If the points are dispersed more widely,
but still form a rough line, then the
correlation is _______________________.
Line of Explain.
…affectionately known as LOBF
How do I draw it?
What is it?
Line of Best Fit Explain.
To be able to make predictions, we need to model the data with a line or a curve of best fit.
Guide for drawing a line of best fit:
1. The line must follow the ______________.
2. The line should __________ through as many points as
3. There should be ____________________________ of points
above and below the line.
4. The line should pass through points all along the line, not just
at the ends.
And what is wrong with the others?
Line not in middle of points
Doesn’t model trend
Wrong for all kinds of reasons!
(line needs to be extended)
Extend the line! not actually recorded or plotted.
Is this interpolation or extrapolation?
How tall would a person be that had a humerus of 44 cm?
181 cm tall
Is this interpolation or extrapolation? not actually recorded or plotted.
How long would a person’s humerus be that was 163 cm tall?
28 cm long
Makin’ sure you get it! not actually recorded or plotted.
See bottom of handout