Question

question #14
determine if the following scenario is best described as an observational study, survey, or experiment.
a researcher wants to determine if a relationship exists between post - traumatic stress disorder and heart disease. the researcher looks at medical records of 100 people with post - traumatic stress disorder and 100 people without the disorder and records whether or not the participants suffer from heart disease.
experimental study
survey
observational study
question #15
determine if the following scenario is best described as an observational study, survey, or experiment.
a math teacher announces a study session to be held the day before a test. the teacher makes note of the students who attend the session then compares scores of students who attended to those who did not.
survey
observational study
experimental study

Explanation:

Question #14

An observational study observes and records data without interfering. Here, the researcher just looks at existing medical records (no intervention like giving a treatment or asking questions via a survey).

An observational study observes and records data without interfering. The teacher just notes who attended (no manipulation like forcing students to attend or creating a survey - style questions).

Answer:

Observational study

Question #15