Answer:
critical value is 4.41 
Explanation:
Given data 
n = 10
α = .05
to find out 
the critical value
solution
first we calculate degree of freedom i.e
 degree of freedom = n -1 
 degree of freedom = 10 - 1 
degree of freedom = 9
and
degree of freedom 2 =( n -1 ) 2
degree of freedom 2 =( 10 -1 ) 2
degree of freedom 2 = 18
so for degree of freedom 9 and degree of freedom 2 is 18 and α = .05
critical value is 4.41