1. Hypothesis Tests
Proportions

2. Test Statistic and Critical Value(s) for a Proportion Test
(Same Method as a Z Test)

3. Example……
A medical researcher claims that less than 20% of adults in the U.S. are allergic to a medication. In a random sample of 100 adults, 15% say they have such an allergy. Test the researcher’s claim at
Values:

4. Answer……

5. Example……
A researcher claims that less than 30% of adults in the U.S. are allergic to grass. In a random sample of 86 adults, 20% say they have such an allergy. At , test the claim.
Values:

6. Answer……

7. Example……
An educator estimates that the dropout rate for seniors at high schools in Ohio is 15%. Last year, 38 seniors from a random sample of 200 Ohio seniors withdrew. At
test the educator’s claim.
Values:

8. Answer……

9. Example……
An attorney claims that more than 25% of all lawyers advertise. A sample of 200 lawyers showed that 63 had advertised. Test the claim at
Values:

10. Answer……