Observational Experiment or Survey

To test the effects of breakfast on grades I ask my students if they ate breakfast and then compare the breakfast eaters grades to the non-breakfast eaters. This is an example of:

• Observational study

• Experiment

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

• experiment

• observational study

Researchers wanted to know if there is a link between proximity to high-tension wires and the rate of leukemia in children. To conduct the study, researchers compared the rate of leukemia for children who lived within 1/2 mile of high-tension wires to the rate of leukemia for children who did not live within 1/2 mile of high-tension wires.

• Observational Study

• Experiment

a controlled study in which the researcher attempts to understand cause-and-effect relationships by assigning subjects to groups and deciding which treatments each group receives

• survey

• observational study

• experiment

A study where researchers deliberately impose treatment on the individuals.

• Experiment

• Observational Study

• Survey

• Census

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 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

a study in which the researcher attempts to understand cause-and-effect relationships without assigning subjects to groups or deciding which treatments each group receives

• survey

• observational study

• experiment

a questionnaire given to a population or a sample of population

• survey

• observational study

• experiment

You want to find out if people who eat a candy bar immediately before a math test get higher scores than people who do not.

• survey

• observational study

• experiment