Middle school class representatives conducted a poll during lunch to see which activity students wanted for their year-end party. The results are shown in this relative frequency table: a) For the entire school, which was more popular, water slides or roller skating?

b) 34% of the 6th graders and 50% of the 7th graders want to go to the water slides. What percentage of the 8th graders want to go to the water slides?

c) Does there seem to an association between grade level and field trip choice?

d) If this trend continued, would you expect 9th graders to prefer the water slides or roller skating? Explain your answer.