A survey claims that 9 out of 10 doctors recommend aspirin for their patients with headaches. To test this claim, a random sample of 100 doctors results in 83 who indicate that they recommend
Aspirin. Which of the following tests will you perform?
A) t test for the mean.
B) Z test for the proportion.
C) Pooled-variance t test.
D) Separate-variance t test.

Question

Quizplus · Accepted Answer

The Z test for the proportion is appropriate here because we are dealing with a sample proportion (83 out of 100) and comparing it to a claimed population proportion (9 out of 10 or 0.9).

A Survey Claims That 9 Out of 10 Doctors Recommend