A beleaguered PhD candidate has the impression that he must find significant results if he wants to defend his dissertation successfully. He wants to show a difference in social awareness, as measured by his own scale, between a normal group of students and a group of exdelinquents. He has a problem, however. He has data to suggest that the normal group has a true mean equal to 38, and he has 50 of those subjects. For the other group he has access either to 100 college students who have been classed as delinquent in the past or to 25 high school dropouts with a history of delinquency. He suspects that the scores of the college group come from a population with a mean of approximately 35, whereas the scores of the dropout group come from a population with a mean of approximately 30. He can use only one of these groups—which should it be?
Answer to relevant QuestionsGenerate a table analogous to Table 15.2 for power equal to 0.80, with a = .01, two-tailed. Use G*Power or Piface to calculate the power of the comparison of Thematic Apperception T scores from the parents of schizophrenic and normal subjects in Exercise 14.8. A neuroscience laboratory run by a colleague of mine studied avoidance behavior in rabbits for many years and published numerous papers on the topic. It is clear from this research that, for animals that have not received ...Using the data in Exercise 16.2, calculate MSerror directly rather than by subtraction and show that this is the same answer you found in that exercise. Langlois and Roggman (1990) took facial photographs of males and females. They then created five groups of composite photographs by computer-averaging the individual faces. For one group the computer averaged 32 randomly ...
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