
112 Nonparametric Statistics for Social and Behavioral Sciences
paired values. The condence interval is the smallest difference (lower limit)
and largest difference (upper limit) between the pairs. Table4.6 displays
calculations for paired differences between the following data sets: group 1
[4.3, 4.5, 4.9, 5.1] and group 2 [3.0, 3.3, 3.5, 3.7].
Based on the difference values in Table4.6, the point estimate can be calcu-
lated using the formula, (n
1
× n
2
)/2 = 8. The sum of (0.8 + 1.9)/2 = 1.35; thus,
the point estimate is 1.35. The approximate 95% condence interval for the
point estimate is (0.8, 1.9), trimming the extreme values from both ...