each student in a sample of 490 students at a state university was classified according to year in school freshman, sophomore, junior, senior and what type of body art the student had body piercing only, tattoos only, both tattoos and body piercing, and no body art. use JMP output to answer the questions. you can assume that the sample is a random sample and that the sample size of 490 is large enough for a chi-square test to be appropriate.