Child and Crim Psych sample sizes

OCR Psychology paper 3

Van Leeuwen et al - Twins study - Sample

112 families with DZ or MZ twins from Netherlands. Self-selected

Barkley-Levenson and Galvan - EV in the brain - Sample

19 adults and 22 adolescents from USA. Self-selected

Gibson and Walk - Visual cliff - Sample

36 Infants, aged 6-14 months.

Wood et al - Tutoring - Sample

30 children from Massachusetts, USA. Even split into ages 3, 4 and 5. Self-selected.

Ainsworth and Bell - Attachment types - Sample

56 One-year-old babies, white middle-class from USA.

Johnson and Young - Advertising - Sample

147 adverts, aired on Nickelodeon USA.

Raine et al - Brain abnormalities in Murderers - Sample

41 murderers and 41 non-murderers, matched on age/gender, tried in California & in California area.

Hall and Player - Fingerprints - Sample

70 Met Police Fingerprint Bureau practicioners, UK.

Dixon et al - Jury’s Perceptions - Sample

119 undergraduates from Worcester University, UK.

Wilson and Kelling - Police & safety - Sample

Zimbardo’s car experiment in USA only: Bronx NY and California.

Haney et al - Simulated prison - Sample

24 males, college students in Stanford area.