From telephone interviews with 980 adults, it was found that 78% of those persons supported tougher legislation

Question:

From telephone interviews with 980 adults, it was found that 78% of those persons supported tougher legislation for antipollution measures. Does this poll substantiate the conjecture that more than 75% of the adult population are in favor of tougher legislation for antipollution measures? (Answer by calculating the P-value.)