Texas Instruments TI-83

13-18 Inferential Statistics and Distributions

8313INFE.DOC TI-83 international English Bob Fedorisko Revised: 02/19/01 12:47 PM Printed: 02/19/01 1:38 PM

Page 18 of 36

2.SampZInt (two-sample z confidence interval; item 9)

computes a confidence interval for the difference between

two population means (m1Nm2) when both population

standard deviations (

1 and

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}

Data Stats

Input:

Calculated results:

2-SampZInt