ch 18

What is the main purpose of experimental and quasi-experimental research as mentioned in Ch. 18?

• To establish a cause and effect relationship between two variables.

• To compare the effect of different treatments on several classes.

• To control threats to internal validity.

• To require random selection of groups.

Which of the following is NOT listed as a threat to the internal validity of the study in Ch. 18?

• Maturation of participants.

• Inconsistent testing procedures.

• Random selection of groups.

• Tester bias.

According to Ch. 18, what is recommended to control threats to internal validity?

• Using a single subject design.

• Randomization to equalize treatments between groups.

• Comparing the effect of different treatments on several classes.

• Giving a retention test after the initial data collection.

What can threaten the external validity of a study according to Ch. 18?

• Random selection of groups.

• Uniqueness of the research group and an atypical testing environment.

• Control and experimental groups.

• A retention test given after data collection.

What design is mentioned in Ch. 18 as being used in many APE experimental studies and why?

• Quasi-experimental design, because it requires random selection of groups.

• Single subject design, because comparable control groups cannot be found.

• True experimental design, because it controls threats to internal validity.

• Randomized control trials, because they are easy to implement.

What does a true experimental design require according to Ch. 18?

• A single subject design.

• Random selection of groups, experimental research, and control groups given.

• A retention test to determine long-term impact.

• Comparing different treatments on several classes.

How can the long-term impact of a treatment be determined as per Ch. 18?

• By conducting a single subject design study.

• Through random selection of groups.

• By giving a retention test at some point after the initial data collection has been completed.

• By controlling threats to internal validity.