. How can the internal validity thrcat of mortality be disruptive to psychologic

Question

. How can the internal validity thrcat of mortality be disruptive to psychological research? 6. How can the internal validity threat of maturation be disruptive to psychological research? 7. What is a quasi-experiment? How do quasi-experiments diffier from traditional experiments? 8. Why are non-equivalent control group designs and time series designs classified as quasi- experiments? Provide an example of each type of design, moting its strengths and weaknesses How do cross-sectional designs and longitudinal designs differ from one another? 9. 10. What are some of the advantages and disadvantages asseciated with open- and closed-ended questions? When is it preferable to usc one in favor of the ether 11. Name several characteristics of good surveys. 12. What is an Experience Sampling Mcthod (ESM)? How are ESMs used by psychologists? 13. In what ways can applied or ficld rescarch peovide service to communitics? Chapter 14. What are some of the challenges rescarcher face when they want to conduct research with non-traditional or special populations ofresearch partspusie-those who are not traditional-aged college students) 15. What are the benefits of conducting rescarch with noo-traditional or special populations of research participants (i.c those who are not traditional-agad collage students) 6. What opportunitics does external validity provide to rescarchers? 17. What is ecological validity? Provide an example

Explanation / Answer

Mortality in internal validity is a major cause of threat because it becomes an alternative explanation for the result to the experiment. Mortality refers to loss of subjects in an experiment. Individuals often drop out of experimental research. However, it affects the internal validity of the experiment. For instance, a researcher wants to test smoking, he assigns the subjects to two groups, experimental and control group. However, heavy smokers drop out of the experiment during posttest. The posttest is then given to the light smokers who are still a part of the experimental group. Since the heavy smokers dropped out, in a comparison of experimental group with control group, the results obtained would show less smoking in the experimental group, even if the independent variable had no effect due to the drop out. Morality ends up being the possible alternative explanation to the experiment.

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