Drinking glucose improves listening span in students who miss breakfast

Morris & SarllPresented by Dr. Christine Malone

Drinking glucose improves listening span in students who miss breakfastClassifying the DesignPlease recall discussion Q9:This research report is identified as an example of true experimental research in the table of contents of this book. Do you agree with the classification?

Yes or no?

What are the features of a true experiment?Features of an experimentThe experimenter manipulates at least one IV. A DV is used to measure the effects of the IV.

4 characteristics of true experiments: (Specify each for this study.)1 MANIPULATION2 MEASUREMENT 3 COMPARISON 4 CONTROL

Is this a between-subjects or within-subjects design?

Questions 1) What is the cause-effect relationship being tested by the authors?

2) What is the evidence that supports the above cause-effect relationship?

3) How would you rate the internal validity of this experiment?

4) Are there any threats to the internal validity of this experiment? If so, how should they be dealt with?Internal ValidityExtent to which other causes are ruled outextent to which the difference in behavior can unambiguously be attributed to the manipulation

A researcher's ultimate goal: This is what happened, and this is what it means. Any factor that raises doubts about the research results or about the interpretation of the results is a THREAT TO VALIDITY.

Manipulation Check--A measure to see whether the independent variable has the intended effect on the participant. Two ways to check the manipulation:(1) An explicit measure of the IV **Relevant here**2) Ask specific questions about the manipulation after the experiment

ApplicationsWhat conclusions would you draw from this study if you were summarizing for a workshop audience of teachers?