A university is interested in evaluating registration proces

A university is interested in evaluating registration processes. Students can register for classes by using either a telephone registration system or an online system that is accessed through the university\'s web site. Independent random samples of 80 students who registered by phone and 59 students who registered online were selected. Of those who registered by phone, 55 reported that they were satisfied with the registration process. Of those who registered online, 49 reported that they were satisfied. (Use a statistical computer package to calculate P.)

z=

P=

Solution

Hypothesis test for two independent proportions p1 p2 pc 0.6875 0.8305 0.7482 p (as decimal) 55/80 49/59 104/139 p (as fraction) 55. 49. 104. X 80 59 139 n -0.143 difference 0. hypothesized difference 0.0745 std. error -1.92 z .0549 p-value (two-tailed)