Determine whether or not it is appropriate to use the large sample confidence interval formula for estimating the difference between two proportions, when

(a) ???????? = 30, ???????? = 25, ˆ???????? = 0.03, and ˆ???????? = 0.06.

(b) ???????? = 60, ???????? = 75, ˆ???????? = 0.24, and ˆ???????? = 0.18.

(c) ???????? = 90, ???????? = 90, ˆ???????? = 0.90, and ˆ???????? = 0.87.