# Question

When you compute difference scores (for a paired samples t test), what happens to the parts of scores that are associated with stable individual differences among persons? (In the models in this chapter, these parts of scores were denoted i.) For example, in the study about stress and HR, after difference scores are computed, is there any variance among the difference scores that is due to individual differences in HR?

## Answer to relevant Questions

Do most researchers still insist on at least interval level of measurement as a condition for the use of parametric statistics? Look at the standard normal distribution in Figure 1.4 to answer the following questions: a. Approximately what proportion (or percentage) of scores in a normal distribution lie within a range from -2σ below the mean to ...Assume that a population of thousands of people whose responses were used to develop the anxiety test had scores that were normally distributed with µ = 30 and σ = 10. What proportion of people in this population would ...Why is the SSerror term in repeated measures ANOVA typically smaller than the SSwithin term for a between-S ANOVA? 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 ...Post your question

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