the degree of freedom for statistict for period t-test based on a pair of observation is
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The p-value, corresponding to the absolute value of the t-test statistics (|t|), is computed for the degrees of freedom (df): df = n - 1 .
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One sample t-test formula
m is the sample mean.
n is the sample size.
s is the sample standard deviation with n−1 degrees of freedom.
μ is the theoretical mean.
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