A psychologist tests the hypothesis that early toilet training leads to personality of excessive compulsiveness about cleanliness, and, conversely, that late toilet training leads to sloppiness

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A psychologist tests the hypothesis that early toilet training leads to personality of excessive compulsiveness about cleanliness, and, conversely, that late toilet training leads to sloppiness. Previous studies have shown that middle-class children receive their toilet training earlier than lower-class children so that one group is formed of middle-class children and another of lower-class children. Both groups are provided with a finger painting task. Such data are recorded as to the extent to which children smear their hands and arms with paints, whether they clean up after the session, and how many times they wash the paints from their hands. Comparisons of the two groups on these criteria indicate that the middle-class children are reliably more concerned about cleanliness than are those of the lower-class. It is thus concluded that early toilet training leads to compulsive cleanliness, whereas later toilet training results in less concern about personal cleanliness. 

 

1. What is the problem in this study?
2. What is the research hypothesis?
3. What are the operational definitions for the IV and DV?
4. Give 2 extraneous variables and recommend specific ways of controlling them each.