PPT Slide
1. Identify the independent and dependent variables in this research.
2. What type of experimental design was used in this study?
3. Construct a set of cell and marginal mean scores that would be
consistent with the main and interaction effects found by MTO
investigators. In so doing, assume that any nonzero difference
between mean scores is statistically significant.
4. Identify three important threats to internal validity in the research
design described above. In each case, explain why the threat applies
and how it would be expected to affect the results of the research.
5. Identify one factor that contributes positively to the external validity of
this research project and one factor that detracts from external validity.