Ulcers are sores on the lining of the digestive tract, caused by the bacteria Helicobacter pylori. You want to test the effectiveness of two new treatments for stomach ulcers. Out of 750 people with stomach ulcers, who are willing to serve as subjects, you record a number of various demographic variables. For example, you do find that 100 subjects are under 18 years old, 250 subjects are 18-35 years old, 250 subjects are 35-55 years old, and 150 subjects are older than 55 years.

a. Completely randomized design

b. Randomized block design

c. Matched pairs design

Answer rating: 100% (QA)

Here we are having treatm... View the full answer