Question

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 lower confidence limit of the 99% confidence interval for the difference between the two population proportions?

• A. -0.011

• B. 0.036

• C. -0.036

• D. 0.011

Please choose A,B,C or D

Answer 1

The statistic software output for this problem is:

The lower confidence limit of the 99% confidence interval for the difference between

the two population proportions is 0.011

Option D)