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38
CHAPTER
2
Manual Operations
Oe
Exercise:
The table below shows the ratios of advertising expenditure (advertising expendi-
sor] 1 [2|3)
4/5 /6|7
Ratio
of adver'sing | 9.8| 2.1 | 2.5 | 1.8| 3.1) 4.0 | 1.0
Ratio
of operating | 2.5 | 3.4| 3.7 | 3.2| 4.3] 6.3 | 2.3
Approach:
Draw up a scatter diagram based on the table.
y
e+
5+
ad
Ratio of operating profit
al
ol*
1+
—t
ttt
123
4
xn
Ratio of advertising expenditure
correlationship when r= 0.
Now input data' on the seven stores and obtain statistics.
r
25
Statistical Calculations
Operation:
cam
Gar
|r) ea eee
0.802.5m
2.103.48)
(Statistical memories cleared)
(Input all the paired data.)
(Estimated value of x)
Gr} EX 5 7 be
2, 281
(Estimated value of y)
MS4.563
(6,4
39
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