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.

Question

Quizplus · Accepted Answer

Taking a larger sample size will decrease the margin of error as the larger sample size represents the population better and reduces the chance of sampling error. This can be done while still maintaining a 90% confidence level.

Another Member of the City Government Is Satisfied with 90