THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION

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