Day 3:
LINEAR AND NONLINEAR RELATIONS
A
linear relation
produces a fairly straight
line on a graph.
You can draw a straight line
to show the relation, called a line of best fit.
This line should have
about the same number
of points
above and below it.
A
nonlinear relation
does not produce a
straight line on a graph. You can draw a
smooth curve to represent the data, called a
curve of best fit.
You can use the line or curve of best fit to
interpolate
(estimate a value that is between points in the data).
You can extend the line or curve of best fit to
extrapolate
(estimate a
value that is beyond the data points).
Day 1:
SCATTER PLOTS
A scatter plot is a graph with points plotted to show the relationship
between two variables.
The variable that affects the other variable is called the independent
variable, and goes on the xaxis (horizontal).
The variable that is affected by (or depends on) the other variable is
called the dependent variable, and goes on the yaxis.
You can describe the relationship on a graph by saying how the
independent variable affects the dependent variable.
Ex
As the number of
days in the
holidays
increases, the
weight
increases.
Day 2:
CORRELATION
Trends (also known as correlations) refer to patterns in data.
A
correlation can be either upward or downward.
Upward Correlation
Downward Correlation
Correlations can also be strong or weak, depending on how clearly the
points are going in a direction.
Both graphs above have strong
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 Spring '11
 Dr.EmirJunver
 Statistics, Derivative, Slope, Correlation, Scatter Plots

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