The number of independent pieces of information used to calculate a statistic is called the degrees of freedom, which is frequently denoted by the letters v or df. I
Itbis determined by subtracting the number of restrictions from the sample size. Subtract the number of relations from the number of observations to determine degrees of freedom. You need to deduct one (1) from the total number of observations, n, in order to calculate the degrees of freedom for a sample mean or average.
The degrees of freedom for the chi-square are calculated as df = (r-1)(c-1) where
r = the number of rows
c = the number of columns.
If the observed chi-square test statistic is greater than the critical value, the null hypothesis can be rejected.
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