TI-89 / TI-92 Plus / Voyage™ 200 PLT Statistics with List Editor App ‰ Ints (Intervals) Menu 178
ZInterval
Description
2 ‰ (
Ints) Æ 1:ZInterval for the TI-89
‰ (Ints) Æ 1:ZInterval for the TI-92 Plus / Voyage™ 200 PLT
ZInterval (one-sample z confidence interval) computes a confidence interval for an
unknown population mean (m) when the population standard deviation (s) is known.
The computed confidence interval depends on the user-specified confidence level
probability.
Data Inputs
s Known standard deviation for data sequence in List.
List The name of the list containing the data.
Freq (optional) The name of the list containing the frequency values for the data in List.
The default is 1. All elements must be real numbers |0.
Each element in the frequency
(Freq) list is the frequency of occurrence
for each corresponding data point in the input list specified in the
List
field.
C Level Confidence level probability with default = .95
Stats Inputs
s Known standard deviation for data sequence in List. The default is 1.
x Sample mean of a data sequence from the normal random distribution.
n Length of the data sequence with sample mean.
C Level Confidence level probability with default = .95
Data and Stats Outputs
Outputs Stored to Description
C Int lower,
upper
Confidence interval for an unknown population mean.
x x_bar Sample mean of the data sequence from the normal random distribution.
ME me Margin of error.
Sx sx_ Sample standard deviation.
n n Length of the data sequence with sample mean.
s s Known population standard deviation for data sequence List.
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