A Sample of 250 People Resulted in a Confidence Interval

Multiple Choice

A sample of 250 people resulted in a confidence interval estimate for the proportion of people who believe that the federal government's proposed tax increase is justified is between 0.14 and 0.20. Based on this information, what was the confidence level used in this estimation?

A) Approximately 1.59
B) 95 percent
C) Approximately 79 percent
D) Can't be determined without knowing σ.