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

We will perform a Z test for the proportion since we are testing a claim about a proportion (9 out of 10 doctors) using a sample proportion (83 out of 100 doctors). The sample size is large enough (n=100) to justify using a Z test instead of a t test.

A Survey Claims That 9 Out of 10 Doctors Recommend