A researcher randomly assigns participants to a high volume or a low volume movie group and records food intake during the movie. At the end of the study, she finds that about half of the participants in each movie group dropped out of the study. Which statement about this research situation is true?
A. The study demonstrates evidence of homogeneous attrition and so it may be associated with low internal validity.
B. The study demonstrates evidence of heterogeneous attrition and so it may be associated with low external validity.
C. The study demonstrates evidence of heterogeneous attrition and so may be associated with low internal validity.
D. The study demonstrates evidence of homogeneous attrition and so it may be associated with low external validity.
Ans: D
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