t-Test for Correlated Samples (n per sample up to .)


This page will calculate the value of t for the difference between the means of two correlated samples, for sample sizes up to n=. It will also calculate various summary statistics for the two samples.

The logic and computational details of this test are described
in Chapters 9 and 12 of Concepts and Applications.



Enter the values of Xa and Xb into the cells of the designated columns, beginning in the top-most cell of each column. After each entry, depressing the 'tab' key will take you down to the next cell in the column. After all values of Xa and Xb have been entered in this fashion, click the button labeled «Calculate».

If you wish to perform another analysis with a different set of data: click the «Reset» button if the value of n for the new set of data is or smaller; click the «Reload» button if the value of n is larger than.Q If you wish to perform another analysis with a different set of data: click the "Reset" button if the value of n for the new set of data is or smaller; click the "Reload" button if the value of n is larger than.Q
Data Entry
Pairs Xa Xb d=XaXb
     

Data SummaryQ
Summary Xa Xb d
n
sum
mean
sumsq
SS
variance
st. dev.
Variances and standard deviations are calculated
with denominator = n-1.

MeanaMeanb t df
  P   one-tailed
two-tailed



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