Surveys Experiments and Observational Studies

This research method is a technique for ascertaining the self – reported attitudes or behaviors of a particular group, usually by questioning a representative, random sample of the group.

• Observational

• Survey

• Experiment

This is a method of research where the researcher carefully and systematically observes and records behavior without interfering

• Survey

• Observational

• Experiments

This is a method of research where an investigator manipulates one or more factors (independent variables) to observe the effect on some behavior or mental process (the dependent variable).

• Survey

• Experiments

• Observations

Determine whether the situation is an experiment or observational study.

A park employee wants to know if latex paint is more durable than non-latex paint.  She paints 50 benches with latex paint and 50 with non-latex paint.

• Experiment

• Observational Study

You want to see if students who have a 4.0 grade point average study more than those who do not.

• survey

• observational study

• experiment

A professor finds that people who are obese have higher cholesterol levels than those who are not obese.

• Observational Study

• Experiment

A study where researchers deliberately impose treatment on the individuals.

• Experiment

• Observational Study

• Survey

• Census

A researcher asks college students how many hours of sleep they got on an average night and examines whether the number of hours of sleep affects the students’ grades

• Experiment

• Survey

• Observational study

Determine whether the situation is an experiment or observational study.

A researcher asks students the average number of hours of sleep they get per night and examines whether the amount of sleep affects students' grades.

• Experiment

• Observational Study

A recent survey found that out of 400 random American adults, 89% pay their bills on time. The margin of error in this survey was 2%. What is the interval of values in which the true proportion is likely found?

• 87% - 89%

• 388 - 402

• 87% - 91%

• 89% - 91%