A news article refers to a poll that "surveyed 978 registered voters and carries a plus or minus 3.5% margin of error." Assuming a 95% confidence interval, compute the true margin of error.
A)3.2%
B)3.3%
C)3.4%
D)3.5%

Question

Quizplus · Accepted Answer

The margin of error is calculated as z * sqrt((p * (1 - p)) / n), where z is the z-score corresponding to the desired confidence level, p is the sample proportion, and n is the sample size. For a 95% confidence level, z = 1.96. The sample proportion is not given, so we cannot calculate the exact margin of error. However, we can use the given margin of error of 3.5% as an estimate of the true margin of error.

A News Article Refers to a Poll That "Surveyed 978