Inferential Statistics and Distributions 13–13
8250FC~1.DOC TI-83 international English Bob Fedorisko Revised: 10/26/05 1:39 PM Printed: 10/27/05 2:57
PM Page 13 of 36
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
(m1:ƒm2)
• H
a
: m
1
<m
2
(m1:<m2)
• H
a
: m
1
>m
2
(m1:>m2)
In the example:
SAMP1={12.207 16.869 25.05 22.429 8.456 10.589}
SAMP2={11.074 9.686 12.064 9.351 8.182 6.642}
Data Stats
Input:
,,
Calculated results:
,,
Drawn results:
2.SampTTest
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