Exam 8: Experiments

Izzie performed a study in which she introduced a stimulus-longer coffee breaks-and then measured how often employees left early-the dependent variable.No pretests were done.Which design did she use?

Experimental mortality effects only need to be controlled when your research focuses on the elderly.

Lyle conducted a study to determine if a new class program could increase the test performance of students with high functioning autism.His experiment specifically included those students who already had high test scores.He should be concerned about which potential form of internal invalidity in his experiment?

Web-based experiments are good because experimental designs are not as strict about representative samples.

Kyo is looking to perform a quick research study to determine the effects of a documentary about domestic violence on people's perceptions of violence.His experiment consists of administering a brief survey to a group,having them watch a movie,then surveying them as they leave to determine if any change occurred.What kind of design is Kyo utilizing?

Michael performed an experiment on police officers to determine the relationship between exercise and stress.One police department's officers performed 30 minutes of exercise at the beginning of their shift,while another department's officers did not.The department who did not take part in an exercise program is known as the

Sharon wanted to determine if the juvenile boot camp program her county had initiated had a noticeable impact on recidivism.She compared similar juveniles who had taken part in the boot camp and those who received a more traditional sentence.Twelve months after their release,she compared their re-arrest rates.In this experiment,the boot camp was the:

A researcher is conducting an experiment over a school year to determine if a drug prevention program is working amongst high school juniors and seniors.They ask students about their drug use habits at the beginning of the school year,and then again after the program ends.Additionally,another demographically similar school that is not using the program is given the same surveys to compare.All of the students had to voluntarily participate in the program.What is not being controlled for/

Ryan wanted to study the effect of adult play with preschoolers on the children's noisiness.So,he went to one preschool for a week and played with the children during breaks.At the end of the week,he measured their noisiness.For comparison purposes,he found another preschool across town and measured their noisiness as well to see the effect of playing with the children.Which design does this example reflect?

Kenny performed an experiment on the effects of after-school educational activities on students' academic performance.His experimental group involved after-school educational activities and his control group involved after-school non-educational activities.The children in the control group felt left out and gave up on the experiment.Which source of internal invalidity is reflected?

The Solomon four-group design

Subjects who leave an experiment before it is completed is an example of _______.

Randomization is the preferred technique for assigning subjects to experimental and control groups when you CANNOT specify in advance the relevant matching variables.

The double-blind experiment attempts to guard against experimenter bias.

Experiments are least appropriate for research projects that involve

Instrumentation is NOT a threat to internal validity in the one-shot case study.

The Solomon Four-group is designed to avoid the problem of selection bias.

The classical experimental design

"Natural" experiments refers to experiments which

Which of the following is LEAST suited to providing clear evidence about a causal relationship between the independent and dependent variables?