1-17. (applied-24) Suppose I am interested in knowing whether adults who are very introverted at
age 20 are still highly introverted at age 50. Which of the following statistical analyses will I
be most likely to use?
a. a comparison of average introversion scores for a sample of adults aged 20 and another
sample aged 50
b. a comparison of average introversion scores at age 20 and age 50 for the same adults
assessed longitudinally
c. an analysis of the average amount in introversion between any 2 measurements of the
same people over time
*d. a calculation of the correlation between scores on the key variable at 2 time points in
a group of subjects studied longitudinally between age 20 and age 50
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