Identify a type of design (e.g., randomized trial,
prospective study, descriptive study, case-control study, etc). for
each of the studies
Fifteen hundred adult males working for Locheed Aircraft are
recruited to participate in a study of coronary heart disease.
Every 3 years they are examined for new occurrences of this
disease. Coronary heart disease rates are compared among groups
defined by personal characteristics as they were recorded at the
beginning of the study.
A random sample of middle-age sedentary females...