Sampttest – Texas Instruments TI-83 PLUS User Manual
Page 403
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TI-83 Plus
Inferential Statistics and Distributions
400
Calculated results:
,
,
Drawn results:
2
.
SampTTest
2
.
SampTTest
(two-sample
t
test; item
4
) tests the equality of the means of
two populations (
m
1
and
m
2
) based on independent samples when
neither population standard deviation (
s
1
or
s
2
) is known. The null
hypothesis H
0
:
m
1
=
m
2
is tested against one of the alternatives below.
•
H
a
:
m
1
ƒm
2
(
m
1:
ƒm
2
)
•
H
a
:
m
1
<
m
2
(
m
1:<
m
2
)
•
H
a
:
m
1
>
m
2
(
m
1:>
m
2
)
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