Samuel and his team are testing two different allergy medicines. they use a list of UNT freshmen and ask every 25th student on the list to participate in the study. 10% of students contacted respond and agree to be apart of the study. Samuel uses a computer to randomly assign participants to either group 1 or group 2. each group will be given a different allergy medicine. participants will record the type and intensity of allergy symptoms for 6 weeks while using their assigned medicine at the recommended dosage. What are the bias?