In 1985, only 8% of the students in the city school district were classified as being learning disabled. A school psychologist suspects that the proportion of learning-disabled children has changed dramatically over the years. To demonstrate this point, a random sample of n = 300 students is selected. In this sample there are 42 students who have been identified as learning-disabled. Is this sample sufficient to indicate that there has been a significant change in the proportion of learning-disabled students since 1985? Use the .05 level of significance.