HP -11C Owner's Handbook Manual page 31
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- Owner's handbook manual (133 pages) ,
- Owner's handbook manual (264 pages)
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58
Section 3: Numeric Functions
.
}
}
Section 3: Numeric Functions
59
Year
1972 | 1973 | 1974 | 1975 | 1976
) i
)
1.
Key the incorrect data pair into the X- and Y-registers.
CoaiProduction(y)
| 1.761 | 1.775 | 1.792| 1.884 | 1.943 |
3
Press [E=]to delete the incorrect data.
{Billions of Metric Tons)
i)
)
Key in the correct values for x and y. If one value of an (x, y)
Electricity Output (x)
5.552 | 5.963 | 6.135|
6.313 | 6.713
data pair is incorrect, you must delete and re-enter both
(Billions of Megawatt Hours!
)
)
values.
a
ae
)
)
4.
Press (3+).
)
)
Keystrokes
Display
)
Note:
Although
(g
|[Z-] can be used to delete an erroneous
2.
)
(x, y) pair, it will not delete any rounding errors that may have
{CLEAR
0.0000
Creat iiulonhneee a
occurred when the statistics of that pair were added into
ih ounh Re rp ke)
)
)
accumulating
registers
R, through
Rs. Consequently,
roUug!
end.sracky
)
subsequent results may be different than they would have
1.761 (ENTER)
1.7610
)
been if the erroneous pair had not been entered via [2+]and
5.652 [3+]
1.0000
1972 data
)
)
then deleted via (2-]. However, the difference will not be
1.775
[ENTER
1.7750
serious unless the erroneous pair has a magnitude that is
5.963 [3+]
2.0000
1973 data
)
y
enormous compared with the correct pair; and in such a case
4.792
1.7920
it may be wise to start over again and re-enter the data again
6.135 [E+
3.0000
1974 data
yy)
)
(and more carefully!)
1.884 [ENTER
1.8840
)
)
6.31
4.0000
1975 data
:
ve =
1.9430
Example. After keying in the preceding data, Voltz found new
iota CENTER)
5. 0000
1976 dat:
)
)
information indicating that the coal output for the last data pair
6.713
[Zs]
ae
1)
)
should have been 1.946 instead of 1.943. Use [2-] to remove the
(Ret) 1
30.6760
Sum of x values (3x) from
statistical data that was accumulated as a result of using the older,
register Rj.
1)
)
incorrect data pair. Then input the correct data pair.
RCL]2
188.9386
Sum of squares of x values
(2x) from register Ry.
i)
)
Keystrokes
Display
9.1550
Sum of y values (Sy) from
yt
y
1.943 [ENTER]
1.9430
Key in the data pair we
register Ry.
,
6.713 [g)(2-}
4.0000
want to replace and delete
16.7877
ro of squares of y values
)
)
the pair's unwanted
(Sy)
from register Ry.
statistics. Number of pair
56.2924
Sum of products of x and y
)
)
entries then drops to 4.
values ([xy) from register
1.946
[ENTER
1.9460
Key in and accumulate
Re.
)
)
6.713 (24)
5.0000
the replacement data pair.
)
Number of pairs
:
sy
A
)
accumulated is again five.
Correcting Statistics Accumulations
)
If you
discover that you
have
entered
data incorrectly,
the
)
Retain the preceding statistics in your calculator for use in the
accumulated statistics can be easily corrected.
)
)
following examples.
a)
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