Practice Problems a. The following table gives the test scores (as Z scores) for two administrations of a personality inventory. Calculate the test-retest reliability of the inventory (Hint: it's just the correlation!). Person # Time 1 Time 2 1 -0.33 0.37 2 0.55 0.28 3 1.16 1.25 4 -0.32 -0.76 5 -1.29 -0.19 6 -0.32 -1.33 ************* b. The three items indexing the extent you procrastinate have the following inter-item correlations. Use Spearman Brown to calculate the reliability of a scale using the three items: n = 112 Procnt1 Procnt2