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TI-83 Plus Tables and Reference Information 681
Function or Instruction/
Arguments Result
Key or Keys/
Menu or Screen/Item
rref(
matrix
)
Returns the reduced row-echelon
form of a
matrix
.
y
>
MATH
B:rref(
R
4
Pr(
x
,
y
)
Returns
R
, given rectangular
coordinates
x
and
y
or a list of
rectangular coordinates.
y
;
ANGLE
5:R
4
Pr(
R
4
P
q
(
x
,
y
)
Returns
q
, given rectangular
coordinates
x
and
y
or a list of
rectangular coordinates.
y
;
ANGLE
6:R
4
P
q
(
2
.
Samp
Ü
Test
[
listname1
,
listname2
,
f
re
q
list1
,
f
re
q
list2
,
alternative
,
draw
f
la
g
]
(Data list input)
Performs a two-sample
Û
test.
alternative
=
L
1
is
<
;
alternative
=
0
is
ƒ
;
alternative
=
1
is
>
.
draw
f
la
g
=
1
draws results;
draw
f
la
g
=
0
calculates
results.
†
…
TESTS
D:2-Samp
Û
Test
2
.
Samp
Ü
Test
Sx1
,
n1
,
Sx2
,
n2
[
,
alternative
,
draw
f
la
g
]
(Summary stats input)
Performs a two-sample
Û
test.
alternative
=
L
1
is
<
;
alternative
=
0
is
ƒ
;
alternative
=
1
is
>
.
draw
f
la
g
=
1
draws results;
draw
f
la
g
=
0
calculates
results.
†
…
TESTS
D:2-Samp
Û
Test
2
.
SampTInt
[
listname1
,
listname2
,
f
re
q
list1
,
f
re
q
list2
,
con
f
idence level
,
p
ooled
]
(Data list input)
Computes a two-sample
t
confidence
interval.
p
ooled
=
1
pools variances;
p
ooled
=
0
does not pool variances.
†
…
TESTS
0:2-SampTInt
2
.
SampTInt
v
1
,
Sx1
,
n1
,
v
2
,
Sx2
,
n2
[
,
con
f
idence
level
,
p
ooled
]
(Summary stats input)
Computes a two-sample
t
confidence
interval.
p
ooled
=
1
pools variances;
p
ooled
=
0
does not pool variances.
†
…
TESTS
0:2-SampTInt