Asurvey 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 he should be rejected at the a) a = 0.10, b) a = 0.05, and c) a = 0.01 level?
o a. a) no; b) no; c) no
ob. a) yes; b) yes; c) yes
oc. a) no; b) no; c) yes
od. a) yes; b) yes; c) no
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