A company believed its new toothpaste to have an effect in controlling tooth decay among children. It randomly selected a group of 400 children and gave them the new toothpaste. Another 300 children were randomly selected also and given another brand of toothpaste. It was found that 30 children using the new toothpaste and 25 children using the other brand suffered tooth decay. Can the manufacturer legitimately argue that the new toothpaste is more effective in controlling tooth decay? Do a 5 % test.