Chapter 13: Inferential Statistics and Distributions 347
2-SampTTest
2-SampTTest2-SampTTest
2-SampTTest
2-SampTTest (two-sample t test; item 4) tests the equality of the means of two
populations (m1 and m2) based on independent samples when neither population
standard deviation (s1 or s2) is 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)
In the example:
Drawn
results:
Data Stats