Question 7 2 pts In a study of the effectiveness of a new allergy medication, 100 people with seasonal allergies are recruited to participate in a study. At random, half of the subjects are given the new medication and half are given a placebo. Neither the subjects nor the clinical researchers know to which group the subjects have been assigned. What type of study is this? Cross-sectional O Prospective cohort Case-control Randomized controlled trial Question 6 2 pts In a study to identify risk factors for multiple sclerosis (MS), researchers use hospital records to identify 25 people with MS and 25 people without MS then interview them about childhood exposures to pesticides and other chemicals. What type of study is this? Cross-sectional Prospective cohort O Case-control Randomized controlled trial Question 1 2 pts Study subjects included in this type of study do not show evidence of the disease under consideration when the study begins. The study subjects are classified by whether or not they have been exposed to the risk factor. The study subjects are observed forward in time to determine the number of new cases of the disease in those with and without exposure to the risk factor. This type of study is Case-control Cohort Cross-sectional Randomized controlled trial