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
Compute the Correlation Coefficienct

or

Compute the Mean of the Differences
Compute the Sum of the Squared Differences
Determine the Number of Pairs

Correlation                                                                                Difference

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Estimate  the Standard Error of the Difference:

Estimate the Standard Error of the Difference:

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ê

Compute t:

Compute t:

î

í

Compute the Degrees of Freedom

df = (Number of Pairs) - 1

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Find the Critical Value of t in Table T

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