A survey claims that 9 out of 10 doctors (i.e., 90%) recommend brand Z for their patients who have children. To test this claim against the alternative that the actual proportion of doctors who recommend brand Z is less than 90%, a random sample of doctors was taken. Suppose the test statistic is z = -2.33. Can we conclude that H0 should be rejected at the a) α = 0.10 b) α = 0.05 c) α = 0.01 level?
a) no; b) no; c) no
a) yes; b) yes; c) no
a) yes; b) yes; c) yes
a) no; b) no; c) yes