Question: If a scale has 0 reliability can it be valid
If a scale has 0 reliability, can it be valid? If a scale has high reliability, such as = .9, does that necessarily mean that it is valid? Explain.
Answer to relevant QuestionsHow do between-S versus within-S designs differ? Make up a list of names for imaginary participants, and use these names to show an example of between-S groups and within-S groups. 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? Discuss the kinds of information that you need to assess reliability of measurements. Why is it important to make certain that all the items in a scale are scored in the same direction before you enter your variables into the reliability program to compute a Cronbach alpha? The data summarized in Table 21.6 (from a study by Goodwin et al., 1973) show how “becoming a heavy smoker” is related to “having a biological parent who was diagnosed alcoholic.” Either enter these data into SPSS by ...
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