A Survey Claims That 9 Out of 10 Doctors (I $\alpha = 0,10 , \text { b) } \alpha = 0,05 \text {, and c) } \alpha = 0,0 ]$

Multiple Choice

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= -2.23 . Can we conclude that H0 should be rejected at the a) $\alpha = 0,10 , \text { b) } \alpha = 0,05 \text {, and c) } \alpha = 0,0 ]$ level?

A) a) yes; b) yes; c) no
B) a) yes; b) yes; c) yes
C) a) no; b) no; c) no
D) a) no; b) no; c) yes