7.3: Descriptive statistics Flashcards
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 the table below:
Measure of central tendency: Group A scores: Group B s:
MEAN 22.4 26
MEDIAN 22.5 22.5
MODE 22 16
Using the data in the table, explain how the distribution of scores in Group A differs from the distribution of scores in Group B (4 marks)
Group A indicates a normal distribution, because the mean, median and the mode are almost the same as in a bell-shaped curve.
Group B is a positively skewed distribution, because the mean is higher than the median or the mode
