HP -22S Owner's Manual page 85

Example: An Equation for Linear Estimation. The following equa-
tion uses the
x,y-data
in the statistics registers to estimate
y
for various
values of x. (Although this calculation can be done using the STAT
menu, the equation allows you to do repetitive estimation calculations
with fewer keystrokes.)
V=Y(X)
Use the following
x,y-data
to estimate
y
for
x
=
2.5, 3.5, and 4.5
x 2 1 3 5 5 4
y
140 92 110 226.5 289 220
Keys: Display:
.1
EQUATIONS
1
Description:
Displays the equation
list.
If necessary, press [!] until the HP-22S displays
TYPE NEW EQN,
Type the equation* and press
I INPUT
I.
Then:
@].ICLEARI
{I}
2 I INPUT
1140
I
};+
1
1 II NPUT
1
92 I
};+
1
3 I INPUT
1110
I
};+
1
5 I INPUT 1 226.5 I
};+
1
5 II NPUT 1 289 I
};+
1
4 II NPUT 1 220 I
};+
1
I EVAL
1
2.5 I INPUT
1
I EVAL 1 3.5 I INPUT 1
I EVAL
1
4.5 I INPUT
1
n=6.0000
Y=144.0938
Y= 186.6813
Y=229.2688
Clears the statistics
registers.
Enters the
x,y-data.
Estimates y for x=2.5.
Estimates
y
for x=3.5.
Estimates
y
for x=4.5.
• The keytrokes for typing the equation are
I
STO
I
y
G I
STAT
I
{L.R.} {)}}
I
STO
I
X
m.
6: Evaluating and Solving Equations 85