Suppose the U.S.government reports that the total number of people in the U.S.who are currently infected with HIV is likely to be between 300,000 and 1,000,000.What is the margin of error for these findings? (Assume a symmetric 95% confidence interval.)
A)+/- 350,000
B)+/- 700,000
C)+/-5%
D)Not enough information to tell

Question

Quizplus · Accepted Answer

The margin of error is calculated as half the width of the confidence interval. The interval is from 300,000 to 1,000,000, so the width is 700,000. Half of that is 350,000, which is the margin of error.