Answer:
22
Step-by-step explanation:
here we have given 12 participants in each group so [tex]n_1=12\ and\ n_2=12[/tex]
we have to find the degree of freedom of this hypothesis
we know that degree of freedom of hypothesis is given by [tex]n_1+n_2-2[/tex]
so by using this formula
degree of freedom of hypothesis = [tex]n_1+n_2-2[/tex]=12+12-2=22
so the degree of freedom of hypothesis will be 22