Experiments

AO2 (2 marks)
Credit up to two marks for an accurate description of an appropriate
methodology in relation to scenario
For example:
- Dr Ashton uses a randomised controlled trial for schizophrenic
patients (1) where the participants were assigned to the three
different schizophrenia treatment programmes (1).
Look for other reasonable marking points.
Generic answers score 0 marks.

(2)

3 (b)

AO2 (2 marks)
Credit one mark a correct identification of ratio/interval data.
Credit one mark for an accurate description.
For example;
- Ratio data (1) because there is an absolute zero that would be
considered meaningful as it shows no symptoms (1).
- Interval data (1) because the intervals between each value are equal
as two symptoms is twice as many as one symptom (1).
Look for other ways of expressing level of measurement.

(2)

3 (c)

\begin{tabular}[t]{l}
AO2 (3 marks)

One mark for correct/appropriate title. One mark for correct/appropriate labelling of axes. One mark for correct plots

A scatter diagram to show the number of reported symptoms of schizophrenia in participants undertaking combined therapy (Condition C)

Length of time in weeks participants involved in trial Look for other reasonable marking points.
\end{tabular}

(3)