Lydon and his associates (1997) conducted a study that compared long-distance to local dating relationships. The researchers first administered questionnaires to a group of students one month prior to their leaving home to begin their first semester at McGill University (Time 1). Some of these students had dating partners who lived in the McGill area; others had dating partners who lived a long way from McGill. The researchers contacted the participants again late in the fall semester, asking them about the current status of their original dating relationships (Time 2). Here is how they reported their results:
Of the 69 participants . . . 55 were involved in long-distance relationships, and 14 were in local relationships (dating partner living within 200 km of them). Consistent with our predictions, 12 of the 14 local relationships were still intact at Time 2 (86%), whereas only 28 of the 55 long-distance relationships were still intact (51%), X2(1, N = 692 = 5.55, p < .02.
(a) Figure the chi-square yourself (your results should be the same, within rounding error).
(b) Figure the effect size.