Texas Instruments TI Programmable 57 User Manual

STATISTICAL FUNCTIONS
AND KEYS
Some Spectiat Notes on Statistica Functions
Occasionally,
when
you're
dealing
with
the
analysis
of
2
sets
of
related
data,
you'll
need
to
“step
up”
the
x
variable
by
one,
for
each
“y”’
variable
you
enter.
(For
example,
for
data
collected
by
year
—
1961,
1962,
1963,
etc.).
In
this
case
you
only
need
to
enter
the
first
x
value,
and
your
calculator
will
automatically
increment
x
by
one
for
each
y
value
entered.
This
feature
is
useful
in
programming
what
are
called
“trend
line
analyses”
—
which
folks
into
statistics
know
about.
Also,
the
variance
calculations
above
all
use
“N
weighting”
—
which
as
folks
who
use
statistics
know,
is
suitable
for
analyzing
population
data.
Statisticians
use
(N-1)
weighting
when
analyzing
sample
data.
To
obtain
(N-1)
weighting
in
variance
calculations,
you
can
use
the
following
key
sequence
alter
calculating
the
variance
from
the
keyboard;
GO
RgO
ICO
kyo).
This multiplies by =]
(Note that the square root of the variance is the standard deviation.)

Texas Instruments TI Programmable 57 Specifications

General

Brand	Texas Instruments
Model	TI Programmable 57
Category	Calculator
Language	English