A VCE Psychology student is conducting an experiment to investigate the effect of blue light exposure before sleep on the production of melatonin. They hypothesise that increased blue light exposure will decrease melatonin production. To measure melatonin production, they collect saliva samples from participants at regular intervals during the night. Which of the following is the most important control for the student to implement in their investigation design?
Ensuring all participants consume the same type of food and drink in the hours leading up to the saliva collection.
Allowing participants to choose their own preferred level of blue light exposure.
Collecting saliva samples at different times for each participant to account for individual differences.
Providing participants with information about the expected effects of blue light on melatonin production.
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Create Free Account Log inThis is a free VCE Units 3 & 4 Psychology practice question worth 1 mark, testing your understanding of Investigation design heading. It falls under How is scientific inquiry used to investigate mental processes and psychological functioning? in Unit 4: How is mental wellbeing supported and maintained?. Submit your answer above to receive instant AI-powered marking and personalised feedback.
In this unit students explore the demand for sleep and the influences of sleep on mental wellbeing. They consider how changes to a person’s sleep-wake cycle can affect psychological functioning. Students explore the concept of mental wellbeing, including social and emotional wellbeing as a multidimensional and holistic framework. They apply a biopsychosocial approach to specific phobia, exploring how biological, psychological and social factors are involved in its development and management. A student-designed scientific investigation involving the generation of primary data related to mental processes and mental wellbeing is undertaken in either Unit 3 or Unit 4 or across both Units 3 and 4, and is assessed in Outcome 3 of this unit.
Students undertake a student-designed scientific investigation in either Unit 3 or Unit 4, or across both Units 3 and 4, related to mental processes and mental wellbeing. The investigation involves the generation of primary quantitative data. Students apply key science skills to develop and test a research question, gather and analyse data, and communicate findings in a structured scientific poster. A logbook is maintained for authentication and assessment purposes.
**Investigation design**
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