CAN SOMEONE HELP ME PLZ

How can a person be self justified he or she is proceeding in legal ways

Arecent poll of 500 residents in a large town found that only 36% were in favor of a proposed referendum to build a new high school. find the margin of error for this poll if we want 95% confidence in our estimate of the percentage of residents in favor of this proposed referendum.

Which supreme court dressed the second a. presser v. illinois b.quilici v. the village of morton grove c.united states v. cruikshank d. united states v. miller