In Piliavin et al.'s study, about 4450 people were present across 103 trials on a 7.5-minute non-stop New York subway journey, in the middle of the day.
Using the information above, explain one strength and one weakness of the sample in Piliavin et al.'s study.
36 exam-style questions on Edexcel GCSE Psychology 5.2 Studies, covering 5.2.1 Piliavin et al (1969) and 5.2.2 Haney, Banks, and Zimbardo (1973). Each one has a worked solution and a mark scheme showing where the marks go.