Test Hypotheses About a Population Proportion
-A Survey Claims That $90 \%$

Multiple Choice

Test Hypotheses about a Population Proportion
-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 100 doctors results in 85 who indicate that they recommend brand $Z$ . The test statistic in this problem is approximately:

A) $- 1.67$
B) $1.67$
C) $- 1.17$
D) $- 1.33$