Classification & Diagnosis of Schizophrenia (AQA A Level Psychology)

A psychologist investigated cognitive processing in two groups of people with schizophrenia. People in Group A showed positive symptoms of schizophrenia and people in Group B showed negative symptoms of schizophrenia.

Each person completed a cognitive task and was given an overall score. The psychologist then calculated average scores for each group. The results are shown in Table 1 below.

Table 1

Using the data in Table 1, explain how the distribution of scores in Group A differs from the distribution of scores in Group B.

Briefly outline and evaluate one study of validity in relation to diagnosis of schizophrenia.