Calculating And Graphing Paired-Variable Statistical Data; Linear Regression Graph - Casio FX-7400G PLUS User Manual

Chapter 7 Statistical Graphs and Calculations
4. Calculating and Graphing Paired-
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.
k k k k k Linear Regression Graph
Linear regression plots a straight line that passes close to as many data points as
P.105
possible, and returns values for the slope and
of the line.
The graphic representation of this relationship is a linear regression graph.
(G-Type)
Q1(GRPH)[4(SET)c
(Scat)
1(Scat)
(GPH1) Q1(GRPH)1(GPH1)
(X)
1(X)
The following are the meanings of the above parameters.
114
Variable Statistical Data
4(DRAW)
a ......
Regression coefficient (slope)
b ......
Regression constant term (
r ......
Correlation coefficient
y y
-intercept ( -coordinate when
1
y
-intercept)
x
= 0)
2 3 4