Dr. Vance is a biopsychologist investigating whether serotonin activity is related to impulsive behaviour. She selects six patients from a neurobiology clinic. She records the concentration of 5-hydroxyindoleacetic acid (5-HIAA) in each participant's cerebrospinal fluid (CSF), measured in nanomoles per litre (nmol/L\text{nmol/L}nmol/L), and then assesses their impulsivity using the Barratt Impulsiveness Scale (BIS-11), scored from 30 to 120. Dr. Vance's results are shown in Table 1.
| Participant | CSF 5-HIAA concentration (nmol/L\text{nmol/L}nmol/L) | Barratt Impulsiveness Scale (BIS-11) score |
|---|---|---|
| A | 55 | 92 |
| B | 82 | 48 |
| C | 60 | 85 |
| D | 74 | 62 |
| E | 45 | 104 |
| F | 68 | 75 |
State a fully operationalised directional (one-tailed) alternative hypothesis for Dr. Vance's study.
Practise Edexcel A Level Psychology Research methods and skills with exam-style questions for A Level Psychology. 657 questions covering Research methods and skills, matched to the Edexcel A Level Psychology (9PS0) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.
