Question: Identify the type of observational study (cross-sectional, retrospective, or prospective) described below.
A research company uses a device to record the viewing habits of about 15,000 households, and the data collected over the past 2 yrs will be used to determine whether the proportion of households tuned to a particular sports program increased. Which type of observational study is described in the problem statement? Choose from the answers below:
a) Retrospective study
b) Prospective study
c) Cross-sectional study