Difference between main and interactive testing effects

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Reference no: EM132245686

1. Explain the difference between main and interactive testing effects. Why is this difference important?

2. History is a key problem in a time series design. “Other problems are main and interactive testing effects, mortality, and maturation.” Explain.

3. Explain why mortality remains a problem even when a Solomon four-group design is used.

4. Why is it wrong to use correlates of a concept to measure that concept?

5. What is meant by operational de?nition, when is it necessary, and why is it necessary?

Reference no: EM132245686

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