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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.)
Y=5C(R)
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
2265
289
220
Keys:
Display:
Description:
B(EQUATIONS)
Displays the equation
list.
If necessary, press (Y] until the HP-22S displays TYPE NEW EGN.
Type the equation* and press [INPUT]. Then:
1 [INPUT] 92 [3+]
3 [ANPUT]) 110 [3+]
5
226.5
5
289
4
220
h=6.0000
25
¥Y=144,0938
Estimates y for x=2.5.
3.5
Y=186.6813
Estimates y for x=3.5.
4.5
¥=229.2688
Estimates y for x=4.5.
* The keytrokes for typing the equation are
Y (=]
{LR.} {5}
X [0J.
6: Evaluating and Solving Equations
85
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