What is the difference between α and standardized α? Why does it make sense to sum z scores rather than raw scores across items in some situations?
Answer to relevant QuestionsWhen a researcher has an accidental or convenience sample, what kind of population can he or she try to make inferences about? What is an “optimally weighted linear composite”? What is a “unit-weighted linear composite”? What are the relative advantages and disadvantages of these two ways of forming scores? Discuss the of kinds information that you need to assess the validity of a measure. How can you use the item-total statistics from the reliability program to decide whether reliability could be improved by dropping some items? Table 21.7 (adapted from Pampel, 2000) shows how values of pi are related to values of odds and values of the logit Li. To do this exercise, you will either need a calculator that has the natural log function or you can find ...
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