There are 300 students in the middle school, 4 seventh graders are running for class president. Which type of survey below would give biased results?
A) Survey 30 middle school students
B) Survey 30 7th graders
C) Survey 70 middle school students
D) Survey all middle school students
Surveying 30 7th graders would give biased results, because 4 seventh graders are running for class president, meaning that 7th graders would be more likely to vote for their fellow classmates who are running
