Question

If everything else stays the same, the margin of error can be reduced by (select all that are true) increasing confidence level decreasing sample size increasing sample size decreasing confidence level

Answer 1

Margin of error, E = Z* $\sigma/\sqrt{n}$

Z* is critical value, which increases with confidence level, $\sigma$ is the population standard deviation and n is the sample size.

Margin of error can be reduced by

• increasing sample size
• decreasing confidence level