<prompt> In a study in UK, an association was found between sale of antiarrythmic drug and an increase in deaths due to asthma. This is an example ofEcological studyCoho studyCase reference studyExperimental study  <response>: Ecological study Ref: Park, 21e p59 19e, p58 Repeat Nov 10 Nov 06 This is an example of ecological study. An ecological study is a type of Observational study where information is collected on a group or population rather than on individual members and then analyzed. Here the association between a summary measure of sale of antiarrythmic drugs risk factor and summary measure of deaths due to asthma outcome is studied. For detailed explanation see Nov10 