13. Apoll by the student paper at University of X on the abolition of foreign language requirements found that 43% of a randomly sampled 150 underclassmen favored the abolition, while 68% of a randomly sampled 150 upperclassmen favored the abolition. Were upperclassmen more likely to favor the abolition of the foreign language requirement than underclassmen?

a.State null and alternative hypotheses. Is this a directional (one-tailed) or non-directional (two-tailed) test?

b.As an investigator, what specific statistical test would you use