Texas Instruments TI-82 STATS - Page 250

13–12 Inferential Statistics and Distributions
8250FC~1.DOC TI-83 international English Bob Fedorisko Revised: 10/26/05 1:39 PM Printed: 10/27/05 2:57
PM Page 12 of 36
2.SampZTest (two-sample z test; item 3) tests the equality of
the means of two populations (m
1
and m
2
) based on independent
samples when both population standard deviations (s
1
and s
2
)
are 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:
LISTA={154 109 137 115 140}
LISTB={108 115 126 92 146}
Data Stats
Input:
,,
Calculated results:
,,
Drawn results:
STAT TESTS Menu (continued)
2.SampZTest