Inferences & Claims From Statistics Practice Test

A researcher emails a survey link to all 3,000 students at a university and receives 240 responses. Among respondents, 68% say they are satisfied with campus dining. The researcher claims, “About 68% of all students at the university are satisfied with campus dining.” Which statement best evaluates this claim?

An environmental club recorded the number of plastic bottles collected at weekly cleanups and the number of volunteers who attended. The line graph shows both quantities rising over 8 weeks. A member claims, “More volunteers caused the increase in bottles collected.” Which conclusion is most appropriate from the graph alone?