Tech 3: INFERENCES
with TI83
(prepared by Krystyna KarminskaMakagon and Andrzej Makagon)
Confidence Intervals

press
STAT
and then select
TESTS
.
1.
One Sample tInterval
A.
If the data are given
, first enter them in L1.
B.
Choose 8 for TInterval, and select "Inpt:DATA", List: L
1
and Freq: 1.
C.
Enter desired confidence level in decimals
D.
Scroll down to "Calculate" and press ENTER.
E.
If the sample mean and sample standard deviation are given
, in step b.
select "Inpt:Stats".
F.
Enter the sample mean and sample standard deviation, the sample size,
and the confidence level. Scroll down to "Calculate" and press ENTER.
2.
Two Sample tInterval
A.
Press 0 for 2SampTInt
B.
Select "Inpt:DATA" or "Inpt:Stats" as needed
C.
The data should either
be entered in two lists (if "Inpt:DATA” is selected),
or sample means, sample standard deviations, and sample sizes for the two
samples should be given (if "Inpt:Stats" is chosen)
D.
Enter the confidence level.
E.
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 Summer '08
 dikong
 Statistics, Normal Distribution, Standard Deviation, Sample standard deviation, A. Press

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