A researcher is going to perform a significance test for the difference between two population proportions ( H_{0} p_{1} = p_{2} ) based on the following sample statistics: X_{1} = 12, n_{1} = 20 X_{2} = 15 n_{2} = 30 Which of the following would be used to compute the value of z for this test?
A. The ri's are too small to justify the use of z-procedures in this situation.
sqrt((0.6)(0.5)(1/20 + 1/30))
sqrt((0.54)(0.46)(1/12 + 1/15))
sqrt((0.54)(0.46)(1/20 + 1/30))
sqrt(((0.6)(0.4))/12 + ((0.5)(0.5))/15)
1 answer
C. sqrt((0.54)(0.46)(1/20 + 1/30))