TI-89 / TI-92 Plus / Voyage™ 200 PLT Statistics with List Editor App ‰ Ints (Intervals) Menu 182
2-SampZInt
Description
2 ‰ (
Ints) Æ 3:2.SampZInt for the TI-89
‰ (Ints) Æ 3:2.SampZInt for the TI-92 Plus / Voyage™ 200 PLT
2.SampZInt (two-sample z confidence interval) computes a confidence interval for the
difference between two population means (m
1
Nm
2
) when both population standard
deviations (s
1
and s
2
) are known. The computed confidence interval depends on the
user-specified confidence level probability.
Data Inputs
s1, s2 Known standard deviations for data sequence List 1 and List 2.
List 1, List 2 Sample data sequences from the normal random distribution.
Freq 1, Freq 2
(optional)
The name of the lists containing the frequency values for the data in
List
1
and List 2. The default is 1. All elements must be real numbers |0.
Each element in the frequency
(Freq) lists is the frequency of occurrence
for each corresponding data point in the input list specified in the
List
fields.
C Level Confidence level probability with default = .95
Stats Inputs
s1, s2 Known standard deviations for data sequence List 1 and List 2.
x1, x2 Means for sample sequences from normal random distributions.
n1, n2 Length of the data sequences with means x1 and x2.
C Level Confidence level probability with default = .95
Data and Stats Outputs
Outputs Stored to Description
C Int lower,
upper
Confidence interval containing confidence level probability of
distribution.
x1-x2 xbardiff Sample means of the data sequences from the normal random
distribution.
ME me Margin of error.
x1, x2 x1_bar,
x2_bar
Sample means of the data sequences from the normal random
distribution.
Sx1, Sx2 sx1, sx2 Sample standard deviations for List 1 and List 2.
n1, n2 n1, n2 Number of samples in data sequences.
s1, s2 r1, r2 Known population standard deviations for data sequence List 1 and List
2
.
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