Casio FX-730P Owner's Manual page 52

42
CHAPTER 2 Manual Operations
Operation:
(Statistical memories cleared)
8~
0 • 8
GJ
2 • 5
8
8~
2 • 1
GJ
3 • 4
8
(Input all the paired data.)
Next, output paired-variable statistics by using STAT LIST 2.
(Mean ofx)
8~8~28
(Mean ofy) 8
(Standard deviation of x) 8
(Standard deviation of y) 8
(Sample standard deviation of x) 8
(Sample standard deviation of y) 8
(Linear regression constant term) 8
(Linear regression coefficient) 8
(Correlation coefficient) 8
Zx/n=2. 185714286
i:""., .. __
-;r
.·-,14·-.. -.C'..,1
O::...~•-'t1-
.
.:•,t•I .L•:•·-'I
:,..,-i·t-,
=
1
n4q~·::i·~·4~·=·
...
..
.
- -·
·-·
-·
-
. _ .,_,
yi:i'n
=
1I2452.35:::1 '3
x ct
r1
-1
=
1 . 1 .3 3 4 7 3 .~~ ::: 1
Yei'n-1= 1. 345008409
a =1.174221646
b =1.14251297.3
r
=0.9628252383
It is evident from the value of
r
that
x
and
y
have a positive correlation. Then,
what advertising expenditure ratio should be adopted to bring the operating
profit ratio to 5 .7%? What operating profit ratio will result when the advertising
expenditure ratio is 4.5%? Now estimate such values.
(Estimated value of x)
(Estimated value of y)
EOX5 . 78
EOY4 . 58
3. 961248986
6
I
3155.30022
It is estimated from the above answers that the advertising expenditure ratio
needed to bring the operating profit ratio to 5 .7% is 3 .96%, and that when the
advertising expenditure ratio is 4.5%, an operating profit ratio of 6.32% will
result.