Texas Instruments TI-83

13-12 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 12 of 36

2.SampZTest (two-sample z test; item 3) tests the equality

of the means of two populations (m1 and m2) based on

independent samples when both population standard

deviations (s1 and

2) are known. The null hypothesis

H0: m1=m2 is tested against one of the alternatives below.

• Ha: m1ƒm2 (m1:ƒm2)

• Ha: m1<m2 (m1:<m2)

• Ha: m1>m2 (m1:>m2)

In the example:

LISTA={154 109 137 115 140}

LISTB={108 115 126 92 146}

Data Stats

Input:

Calculated results:

Drawn results:

2.SampZTest