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B.
Analysis of Data with Two
Variables
The following values are calculated.
n,
x,
un-1, un:
same variables as in analysis
of
data with
one
variable.
r: Correlation coefficient
Sxy
JSxx ·Syy
a, b: Regression coefficient of regression line
y=a+bx
b=Sxy
a
=y-bx
Sxx
x,
y:
Estimated value on regression line
(2:x
)•
when:
Sxx=2:x
2 - -
0
-
24
(2:y
)•
Syy=2;y
• - -
n -
Sxy=2:xy
1 . How to Perform the Calculation
(Setting)
MOCC
1) Set Mode: Depress the
o
key
to set the
mode at STAT.
2) Clearing Data Memories: Depress the
C5
key and then the
00
key to clear
the
con-
tents of the data memories.
(Inputting
Data)
1) Enter the
x
data and depress the
@)
key.
2) Enter they data and
depress the
§3
key.
(Example)
Obtain the correlation coefficient
(r)
and
coefficient a, b, of regression line
(y =a+
bx)
using the data in the following table. Calculate
estimate
x
when y
is 350 and estimate y
when xis 75.
X
y
96
412
64
260
80
375
68
298
60
310
100
490
52
250
100
460
?
350
75
?
25
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