A researcher is going to perform a significance test for the difference between two population proportions (Ho : P1 = P2 ) based on the following sample statistics: X1 = 12, m1 = 20, X2 = 15, n2 = 30. Which of the following would be used to compute the value of z for this test? O A. (.54)(.46) 1 1 20 30 O B. (.54)(.46) 1 1 12 15 O c. (.6)(.4) (.5)(.5) 12 15 O D. The n's are too small to justify the use of z- procedures in this situation. XO E. (.6)(.5) 1 + 1) 20 30 X IncorrectYou want to test your newly created Web site, so you have 250 people access it from random locations at random times. Of the people accessing the site, 75 of them experience computer crashes. Construct a 95% condence interval for the proportion of crashes. O A. (.8432, .7568) )( B. (2992, .3008) O c. (271, .329) O D. (2984, .3016) O E. (243, .3568) X Incorrect