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Visual Summary: 
t Tests Between Two Independent Sample Means


Before You Begin

Compute the Mean for Sample 1
Compute the Standard Deviation for Sample 1
Determine n for Sample 1
Compute the Mean for Sample 2
Compute the Standard Deviation for Sample 2
Determine n for Sample 2
 


ê

ê

Estimate  the Standard Error of the Mean for Sample 1:


 

Estimate the Standard Error of the Mean for Sample 2:


 


î

í

Estimate the Standard Error of the Difference Between the Means:

 


ê

Compute t

 


ê

Compute the Degrees of Freedom:

 


ê

 

Find the Critical Value of t in Table T

 


ê

 

 


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