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Chapter 7 Statistical Graphs and Calculations
4. Calculating and Graphing Paired-
Variable Statistical Data
Under “Plotting a Scatter Diagram,” we displayed a scatter diagram and then per-
formed a logarithmic regression calculation. Let’s use the same procedure to look at
the six regression functions.
kk
kk
k Linear Regression Graph
Linear regression plots a straight line that passes close to as many data points as
possible, and returns values for the slope and y-intercept (y-coordinate when x = 0)
of the line.
The graphic representation of this relationship is a linear regression graph.
Q1(GRPH)[4(SET)c
1(Scat)
Q1(GRPH)1(GPH1)
1(X)
4(DRAW)
The following are the meanings of the above parameters.
a ...... Regression coefficient (slope)
b ...... Regression constant term (y-intercept)
r ...... Correlation coefficient
(G-Type)
(Scat)
(GPH1)
(X)
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