Linear Estimate - HP -33E Owner's Handbook Manual

26 Specific Features of the HP-33E
Keystrokes Display
1960 4.0000
1750 1,750.0000
1965 5.0000
2162 2,162.0000
1970 6.0000
2385 2,385.0000
1975 7.0000 All data pairs have been
keyed in.
(R -107,975.0000 The y-intercept ofline.
55.8786 Slope ofline.
Linear Estimate
With the data totaled in registers R, through R;, a predicted y (that is,
y) can be calculated by keying in a new x-value and pressing |.
A predicted x (that is, X) can be calculated by keying in a new y-value
and pressing [ | .
For example, with the data intact from the previous example, if Turn-
coat wished to predict the demand for oil for the years 1980 and 2000,
he has only to key in the new x-values and press |~ .
Keystrokes Display
1980 " 2,664.5714 Predicted demand in
millions of barrels for the
year 1980.
20000 3,782.1429 Predicted demand in
millions of barrels for the
year 2000.
With the data still intact from before, if Turncoat now wishes to predict
in what years will the predicted demand in millions of barrels of oil be
6,000 and 10,000 millions of barrels of oil, all he needs to do is key
in new y-values and press .
Keystrokes Display
6000 ' 2,039.6907 Predicted year — 2039.
10000 /[ | 2,111.2744 Predicted year — 2111.