In a survey of 472 personnel directors,63% thought that they would be hiring new personnel over the next three months.Which of the following represents a 98% confidence interval for the proportion of all personnel directors planning to hire personnel over the next three months?
A)0.63 ± 0.057
B)0.63 ± 0.047
C)0.63 ± 0.042
D)0.63 ± 0.052

Question

Quizplus · Accepted Answer

The confidence interval is calculated using the formula for the standard error of a proportion and the z-score for a 98% confidence level. The correct margin of error is approximately 0.052.

In a Survey of 472 Personnel Directors,63% Thought That They