Exam 13: Alternative Research Designs

Cook and Campbell (1979) mentioned four threats to internal validity that are not controlled in the nonequivalent group design. Which of the following is NOT one of them?

Briefly explain the four threats to internal validity that are not controlled in the nonequivalent group design.

Questions refer to the following research study: Ronda would like to assess the effects of a reading comprehension course on the scores of students. She gives a group of remedial students a reading comprehension pretest and then randomly assigns them to either the treatment group or the control group. Shortly after the treatment, she measures their reading comprehension scores again. -How has Ronda controlled for the selection threat to internal validity?

How does the pretest-posttest control-group design control for the problem of selection?

One disadvantage of the Solomon four-group design is that

If in a repeated measures design, extremely low scores improve over time (or extremely high scores decrease over time), which threat to internal validity should we be worried about?

____________ occurs when we know that a particular IV leads to a specific change in a DV.

Consider the diagram below. Which type of experimental design is depicted?

What kind of statistical analysis is typically conducted for single-case experiments?

Interactions with ___________ occur if there are systematic differences between or among treatment groups based on maturation, history, or instrumentation.

Why do you think the researchers chose an A-B-A-B design instead of an A-B-A design?

The purpose of random assignment is to

Briefly describe the nine threats to internal validity: (1) selection, (2) history, (3) maturation, (4) testing, (5) statistical regression, (6) interactions with selection, (7) experimental mortality, (8) instrumentation, and (9) diffusion of treatment.

Describe the internal validity threat of selection and give an example.

In single-case experiments, researchers

Which of the following statements is true regarding the use of statistics and quasi-experimental designs?

Questions refer to the following research study: Ronda would like to assess the effects of a reading comprehension course on the scores of students. She gives a group of remedial students a reading comprehension pretest and then randomly assigns them to either the treatment group or the control group. Shortly after the treatment, she measures their reading comprehension scores again. -Which set of results would result in Ronda being worried about maturation?

A single-case experiment in which the researcher measures baseline behaviors, then administers a treatment and measures behavior, and then takes away the treatment and measures behavior is known as an

In one study (Hedrick et al., 1993), researchers compared the number of motorcycle fatalities that occurred before helmets were mandatory, after helmets were mandatory, and after the helmet laws were repealed. This study used an ______ format with the interrupted time-series design.

Describe the internal validity threat of mortality and give an example.