Chapter 13: Inferential Statistics and Distributions 345
2-SampZTest
2-SampZTest2-SampZTest
2-SampZTest
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 s2) are known. The null hypothesis H0:m1=m2 is tested against one of
the alternatives below.
•H
a: m1ƒm2 (m1:ƒm2)
•H
a: m1<m2 (m1:<m2)
•H
a: m1>m2 (m1:>m2)
Calculated
results:
Drawn
results:
Data Stats