SCHOOL OF BUSINESS
Department of Economics
Your
text here 1
Correlation and Linear Regression (𝒀 = 𝒂 + 𝒃𝑿)
How to use the CASIO fx-95 & fx-991 calculators to compute the slope of the regression line “b”,
y-intercept “a”, the correlation coefficient(r) and
(𝒙 − 𝒙)𝟐
CASIO Fx-95 Calculator
Given the following Data for the variables (X& Y):
X
Y
7
11
9
14
11
22
12
27
Ø To Start Linear Regression:
Press
MODE
Lin
1
Reg
3
Ø Data entry:
Press
7
,
11
M+
Press
9
,
14
M+
Press
11
,
22
M+
Press
12
,
27
M+
Press
AC
Ø First: To Calculate y-intercept “a” .
Press
SHIFT
S-VAR
2
▲
◄ REPLAY►
▼
▲
◄ REPLAY►
▼
Then a=-12.898
Press
AC
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A
1
SCHOOL OF BUSINESS
Department
of Economics
Your
text here
2
Ø Second: To Calculate slope “b”
Press
SHIFT
S-VAR
2
▲
◄ REPLAY►
▼
▲
◄ REPLAY►
▼
B
2
Then b=3.22
Press
AC
Ø Third: To Calculate the correlation coefficient “r”
Press
SHIFT
S-VAR
2
▲
◄ REPLAY►
▼
▲
◄ REPLAY►
▼
r
3
Then r=0.9747
Press
AC
Ø Fourth: To Calculate (𝒙 − 𝒙)𝟐 for Prediction or Confidence Interval
Press
SHIFT
S-VAR
2
Xσn-1
3
Then Sx=2.217
Then
Press
(𝒙 − 𝒙)𝟐 =(Sx) 2 *(n-1)=4.917*(3)=14.75
AC
Ø To Finish Statistics Calculations:
Press
MODE
1
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SCHOOL OF BUSINESS
Department
of Economics
Your
text here
3
CASIO Fx-991 Calculator
Given the following Data for the variables (X& Y):
X
Y
7
11
9
14
11
22
Ø To Start Linear Regression:
Press
MODE
STAT
3
A+BX
2
Ø Data entry: Press the number then equal
X
7
9
11
12
Press
Y
11
14
22
27
AC
Ø First: To Calculate y-intercept “a” .
Press
SHIFT
1
Reg
5
A
1
Then a=-12.898
Press
AC
Ø Second: To Calculate slope “b”
Press
SHIFT
1
Reg
5
B
2
Then b=3.22
Press
AC
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12
27
SCHOOL OF BUSINESS
Department
of Economics
Your
text here
4
Ø Third: To Calculate the correlation coefficient “r”
Press
SHIFT
1
Reg
5
r
3
Then r=0.9747
Press
AC
Ø Fourth: To Calculate (𝒙 − 𝒙)𝟐 for Prediction or Confidence Interval
Press
SHIFT
1
VAR
4
Xσn-1
4
Then Sx=2.217
Then
Press
(𝒙 − 𝒙)𝟐 =(Sx) 2 *(n-1)=4.917*(3)=14.75
AC
Ø To Finish Statistics Calculations:
Press
MODE
1
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