Acute Otitis media, an infection of the middle ear, is a common childhood illness. There are various ways to treat the problem. To help determine the best way, researchers conducted an experiment. One hundred and eighty children between 10 months and two years with recurrent acute otitis media were divided into three equal groups. Group 1 was treated by surgically removing the adenoids (adenoidectomy), the second was treated with the drug Sulfafurazole, and the third with a placebo. Each child was tracked for 2 years during which time all symptoms and episodes of acute otitis media were recorded. (Keller, 9th Edition, p. 588)Researchers collected data for the following variables: Number of episodes of the illness, number of visits to a physician because of any illness, number of prescriptions, number of days with symptoms of respiratory infection.Can the researchers conclude that there are differences between the three groups with respect to the number of episodes, number of physician visits, number of prescriptions, and number of days with symptoms of respiratory infections?

Question: When doing a hypothesis test, do we wan to omit type 1 or type II error?