Some experts believe that 21% of all freshwater sh in a country have such high levels of mercury that they are dangerous to eat. Suppose a sh market has 250 sh tested, and 52 of them have dangerous levels of mercury. Test the hypothesis that this sample is not from a population with 21% dangerous sh, assuming that this is a random sample. Use a signicance level of 0.05. Comment on your conclusion. State the null and alternative hypotheses. A. H0: p 0.21 B. H0: p=0.21 Ha:p>0.21 -"c. H0: p=o.21 Ha:p#0.21 D. Ho: p>0.21 a:p