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HP HP-20S - Page 54

HP HP-20S
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2.
3.
Enter
the
first
value
and
press
[(2+].
The
HP-20S
displays
the
number
of
items
(n)
accumulated;
in
this
case,
1.0000.
Continue
accumulating
values
by
entering
the
numbers
and
pressing
(=+].
The
n-value
is
updated
with
each
entry.
Entering
Data
for
Two-Variable
Statistics
or
Weighted
Mean
To
enter
x,y-pairs
of
statistical
data:
4.
Clear
any
previous
contents
of
R,
through
Rg
by
pressing
(]
(cLz].
Enter
the
first
x-value
and
press
[INPUT].
The
HP-20S
displays
the
x-value.
Enter
the
corresponding
y-value
and
press
[=+].
The
HP-20S
dis-
plays
the
number
of
pairs
of
items
(n)
accumulated;
in
this
case,
1.0000.
Continue
entering
x,y-pairs.
The
n-value
is
incremented
with
each
entry.
To
enter
data
for
calculating
the
weighted
mean,
enter
each
data
value
as
x,
and
its
corresponding
weight
as
y.
Correcting
Statistical
Data
Incorrect
entries
can
be
deleted
using
[|]
(2-].
If
either
value
of
an
x,y-pair
is
incorrect,
you
must
delete
and
reenter
both
values.
To
delete
and
reenter
statistical
data:
52
Enter
the
x-value
to
be
deleted.
If
the
data
consists
of
x,y-pairs,
press
and
then
enter
the
y-value.
Press
(%]
to
delete
the
value(s).
The
n-value
is
decreased
by
1.
Enter
the
correct
value
or
x,y-pair
using
[Z+].
5:
Statistical
Calculations

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