14. A researcher randomly selected 100 students from each grade in high school and asked them if they were involved in extracurricular activities. For 9th grade students, 35% responded yes. For 10th grade students, 47% responded yes. For 11th grade students, 63% responded yes, and for 12th grade students, 72% responded yes. At = 0.05, test the claim that there is no difference in the proportion of students in each grade that were involved in extracurricular activities