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HP HP-20S - Summary of Statistical Calculations

HP HP-20S
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Clearing
Statistical
Data
Clear
the
statistical
registers
before
entering
new
data
so
that
R4
through
Ry
are
zero
when
you
begin.
If
you
don't
clear
the
registers,
data
currently
stored
in
R,
through
Rg
is
automatically
included
in
the
summation
calculations.
To
clear
the
statistical
registers,
press
(]
[CLZ].
The
dis-
play
and
any
pending
operations
are
also
cleared.
Summary
of
Statistical
Calculations
Some
functions
return
two
values.
The
:
annunciator
indicates
that
two
values
have
been
returned.
Press
(€]
to
see
the
hidden
value.
Keys
Description
(=)
to
Display
4
(n)
Number
of
data
points
5
(2x)
6
(Zy)
7
(2x?)
8
(Zy?)
9
(2xy)
entered.
Sum
of
the
x-values.
Sum
of
the
y-values.
Sum
of
the
squares
of
the
x-values.
Sum
of
the
squares
of
the
y-values.
Sum
of
the
products
of
the
x-
and
y-values.
()
53]
()
Gw]
Arithmetic
mean
(aver-
age)
of
the
x-values.
Mean
of
the
x-values
weighted
by
the
y-
values.
Mean
(average)
of
the
y-values
if
you
entered
y-data.
5:
Statistical
Calculations
53

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