(1 point) College officials want to estimate the percentage of students who carry a gun, knife, or other such weapon. How many randomly selected students must be surveyed in order to be 97% confident that the sample percentage has a margin of error of 1.5 percentage points? (a) Assume that there is no available information that could be used as an estimate of [3. Answer: (b) Assume that another study indicated that 7% of college students carry weapons