Operation Manual

Chapter 13: Inferential Statistics and Distributions 235
TInterval
TInterval (one-sample t confidence interval; item 8) computes a confidence interval for an unknown
population mean m when the population standard deviation s is unknown. The computed confidence
interval depends on the user-specified confidence level.
In the example:
L6={1.6, 1.7, 1.8, 1.9}
2-SampZInt
2-SampZInt (two-sample z confidence interval; item 9) 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.
In the example:
LISTC={154, 109, 137, 115, 140}
LISTD={108, 115, 126, 92, 146}
Calculated
results:
Data Stats
Input:
Calculated
results:
Data Stats
Input:
Data Stats