Texas Instruments TI Programmable 57 User Manual

STATISTICAL FUNCTIONS
AND KEYS
While
you're
doing
any
statistical
analysis
calculation,
the
data
is
collected
in
the
memories
as
follows:
n (The number of data points)
zy
zy’
=x
=x?
xy
Last x value entered, plus one.
memory
NOV POQOnre oO
Note
also
that
the
formula
used
for
the
variance
is:
Variance
=
2x
rs
bs
fa
The symbol = just means “the sum of".
If
you
make
a
mistake
entering
any
data
point,
you
can
remove
the
bad
points
by
re-entering
them
as
before,
but
pressing
[itv]
before
[2nd]
E@¥ as you key it in.
Example:
You're
grading
an
exam,
and
the
scores
are
in.
You'd
like
to
see
how
well
the
class
has
done.
The
scores
are
tabulated
below:
96 65 81
85 76 86
57: 08: FS
78 100 72
81 70 80
Press
DispLay/CoMMENTS
(INV)
(2nd)
SM
0
Besure
to
clear
the
entire
machine
96
[+]
1.
The
calculator
counts
85 (2nd) Ea 2. your data points for you
continue for all points
72 ‘7
80 i 15.
ES
80.
Class
average
fa (=) 11.564313 Standard deviation.

Texas Instruments TI Programmable 57 Specifications

General

Brand	Texas Instruments
Model	TI Programmable 57
Category	Calculator
Language	English