A breakfast cereal company decided to run a promotion, and they put coupons in 20% of certain cereal boxes for a free kid's toy. Based on their experience, a group of middle school students believes this claim is false, and that less than 20% of the boxes have a coupon. They did an experiment to test their claim. They bought 65 boxes of cereal, and only found 7 coupons for free kids' toys. Let's assume the boxes of cereal purchased were part of a random sample. Do the students have enough evidence to prove that the cereal company's claim is false? Perform an appropriate hypothesis test and state your conclusion.