Two Variable Statistics - Practical Example - LEXIBOOK SC460 Owner's Manual

We notice that the mean is the same but that the standard deviation is
greater this time: we can thus conclude that there is a greater variance
between the students' marks and that their standard is less homogenous in
math than in French.
As an exercise, in this example (using the mathematics marks) the following
values are obtained for ∑x and ∑x
[SHIFT] [S-SUM] 2 [=]
[SHIFT] [S-SUM] 1 [=]
Two-variable statistics – regression calculation
Selecting type of regression
[MODE] 3
followed by 1,2, or 3
or by and 1,2 or 3
[MODE] 1
After having chosen the REG mode (by entering [MODE]3) you have the
following options:
Lin Log
1 2
You can input data into your calculator in the same way, irrespective of the
type of regression selected at the start. Your calculator actually carries out
the necessary modifications itself during data input. For example:
Regression
Linear
Logarithmic
Exponential
Power
Inverse
Quadratic
You will only need to take these modifications into account when you display
the various amounts. For example: for the inverse regression ∑xy becomes
∑y/x, or for the exponential type of regression ∑y
66
SC460IM0237.indb 66

:
-> 115. thus ∑x
-> 1,555.5 thus ∑x
Switch to two-variable statistics mode and choice
between 6 types of regression.
Return to normal mode (COMP).
Exp
3
Formula x is replaced by
y=A + Bx
y=A + B ln x
Bx
y=A e
B
y=A x
y=A+B/x

y=A+Bx+Cx

Pwr Inv
1 2
y is replaced by
x
ln x
x
ln x
1/x
x
 
=∑(lny) .
Copyright © Lexibook 007
Quad
3
y
y
ln y
ln y
y
y
20/6/07 15:28:11