Determine whether the given description corresponds to an observational study or an experiment.

in a study of 422 women with a particular disease, the subjects were asked to complete a survey about their diet upon arrival to a hospital.

The given description corresponds to an observational study:

In a study of 422 women with a particular disease, the subjects were asked to complete a survey about their diet upon arrival to a hospital.

Subjects are observed/studied in an effort to learn more about a particular subject.

credit card number 4 is the right answer

answer; i believe the correct answer is norming;