Essay Analysis

A researcher compared the effectiveness of compressed versus distributed practice in preparing for a memory test. The independent variable for the study was the type of practice (compressed versus distributed practice),
and the dependent variable was the performance on the memory test. Each of two groups memorized the definitions of 40 vocabulary words. In group A, there were 50 participants who were all under twenty-five years
of age. Participants in group A used the method of distributed practice, studying for 30 minutes on each of four evenings.
Label and answer the following:
Identify at least one threat to internal validity
Identify at least one threat to external validity
Identify at least one characteristic that is both a threat to internal and external validity
What changes would you make to alleviate these threats?

Sample Solution