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Question 71

Multiple Choice

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
In a recent survey of 240 teachers in Richmond,Virginia,77.2% supported standardized national testing of elementary students.In a survey of 162 teachers in Raleigh,North Carolina,64.2% supported national testing.
-What is the upper confidence limit of the 99% confidence interval for the difference between the two population proportions?


A) 0.249
B) 0.222
C) 0.265
D) 0.278

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