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11–8 Statistical Operations
File name 33s-English-Manual-040130-Publication(Edition 2).doc Page : 388
Printed Date : 2004/1/30 Size : 13.7 x 21.2 cm
To find an estimated value for x (or y), key in a given hypothetical value for y
(or
x), then press
º
%
{
ˆ
} (or
º
%
{
ˆ
}).
To find the values that define the line that best fits your data, press
º
%
followed by {
}, {
}, or {
}.
Example: Curve Fitting.
The yield of a new variety of rice depends on its rate of fertilization with nitrogen.
For the following data, determine the linear relationship: the correlation coefficient,
the slope, and the
y–intercept.
X, Nitrogen Applied
(kg per hectare)
0.00 20.00 40.00 60.00 80.00
Y, Grain Yield
(metric tons per hectare)
4.63 5.78 6.61 7.21 7.78
Keys: Display: Description:
¹
¡
{
}
Clears all previous statistical
data.
4.63
Ï
0
/
5.78
Ï
20
/
6.61
Ï
40
/
7.21
Ï
60
/
Enters data; displays n.
7.78
Ï
80
/
Five data pairs entered.
º
%
{
}
ˆ
ˆ
Displays linear–regression
menu.
Correlation coefficient; data
closely approximate a strai
g
ht
line.
Õ
ˆ
ˆ
Slope of the line.
Õ
ˆ
ˆ
y
–intercept.