One hundred eighty nine students of both sexes were stopped along a walkway at a university during the daylight hours. Selected students were walking alone and were not approached during the break between classes at the university.
Subjects for the study were 174 male students at the Bar-Ilan University in Israel.
Subjects for the study were 102 male students at the Bar-Ilan University in Israel.
127 people were initially contacted in the study. 95 were successfully recontacted and asked to donate blood. 36 persons in the control group were asked to donate blood for the first time.
The subjects were 192 Kansas City residents whose telephone numbers were randomly selected from the Kansas City telephone directory. The subjects were assigned to six conditions, with each condition containing 32 subjects.
Subjects were 77 undergraduate students enrolled at a midwestern university. Sophomore level students were selected because the yielding plus gaining condition initially asked for a two-year commitment and this ruled out juniors and seniors. Subjects were selected from a pool of all the arts and science sophomores listed in the school directory and randomly assigned to conditions.
One hundred ninety-two subjects of both sexes, chosen when they were alone and moving leisurely along university walkways, were employed in the experiment. Subjects were selected only at times within the slack period between classes. Each subject was approached by a student-experimenter of the same sex.
Two hundred sixteen subjects of both sexes participated in the study. They were chosen when they were alone and moving leisurely along university walkways (at the institution where the study was conducted) were employed in the experiment. Subjects were selected only at times within the slack period between classes. Each subject was approached by a student-experimenter of the same sex.
The subjects were 224 students (112 male and 112 female) at the University of South Carolina. Only those students who were walking or sitting along university walkways during the hours 10 a.m. and 6 p.m. on weekdays were selected, and no subjects known to an experimenter were selected.
Subjects were 381 male and female residents of Greater Columbia, South Carolina, chosen systematically from the telephone directory. Subjects were randomly assigned to one of four conditions: critical-request-only (initial telephone contact) (n=106), large-initial-request (n=96), and critical-request-only (no initial telephone contact) (n=61).
Subjects were 640 Bar-Ilan students that participated in the two stages of the study. Subjects were selected at random, with 240 participating in the pretest, and 400 participating in the actual study.
Subjects were undergraduate student enrolled in introductory psychology courses at California State University in Fresno. Volunteers includes 19 males and 68 females.
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Created February 27, 1996; Last updated February 27, 1996