Another Member of the City Government Is Satisfied with 90

Multiple Choice

Another member of the city government is satisfied with 90% confidence, but she wants a smaller margin of error. How can we get a smaller margin of error, still with 90% confidence?

A) Take a larger sample, because larger samples result in smaller margins of error.
B) Take a smaller sample, because smaller samples result in smaller margins of error.
C) Take another sample of the same size and you might be lucky and get a much smaller margin of error.
D) Take a sample of adults from a neighborhood in the county instead of from the entire county. Then, the population will be smaller which will give a smaller margin of error.
E) Carry out a call-in poll to get a voluntary response sample. Voluntary response samples have no margin of error.