There are 5 conditions which is denoted by K and 6 subjects which makes the population size as N = 5 * 6 = 30
Degrees of freedom which is denoted by dfn, it is the number of independent pieces of info on which the estimation is centered.
It is solved by: Degrees of freedom (dfn) = N -130 – 1 = 29.
Where N here is the population size.
While the error degrees of freedom (dfe) is computed by = N –K 30-5 = 25.