Discuss the of kinds information that you need to assess the validity of a measure.
Answer to relevant QuestionsDo most researchers still insist on at least interval level of measurement as a condition for the use of parametric statistics? For what types of data would you use nonparametric versus parametric statistics? Why is it generally more difficult to establish the validity of a measure than its reliability? 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? Examine the data in Table 21.5, which report the outcomes for the Physician’s Health Study that assessed the effect of a low-dose aspirin regimen on risk of heart attack. a. For the group of patients that had the low-dose ...
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