Determine whether the study depicts an observational study or an experiment. fifty patients

Which of the following is an example of an observational study? Researchers ask people how long they normally sleep every night. Researchers then determine if fewer hours of sleep at night is associated with an increased likelihood of being overweight.

Observation study. measures the value of the response variable without attempting to influence the value of either the response or explanatory variables. that is, an observational study, the researcher observes the behavior of the individuals in the study without trying to influence the outcome of the study.

What does it mean when an observational study is prospective? A prospective study collects the data over time. Observational Study or Experiment. A study is conducted to determine if there is a relationship between skin cancer and hair color. The hair color of patients with skin cancer is recorded.

Prospective. A prospective study watches for outcomes, such as the development of a disease, during the study period and relates this to other factors such as suspected risk or protection factor(s). The study usually involves taking a cohort of subjects and watching them over a long period.