Time left 1:57:5 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? O a. 0.63 ±0.057 O b. 0.63 +0.047 O c. 0.63 +0.042 O d. 0.63 + 0.052 NEXT PAGE IC DA CE

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