A developmental psychologist carried out research into the early vocabulary size of infants aged between 18 months and 24 months old who attended a large early learning center. The parents of these infants had already provided written consent for their children to participate.
Explain how the psychologist could obtain a random sample of 15 infants from this center to take part in the study.
689 exam-style questions on AQA A Level Psychology Scientific processes. Each one has a worked solution and a mark scheme showing where the marks go.