Question 1
Harrison conducted an experiment into the effect of antidepressants on people who had seasonal affective disorder. He allocated his participants into one of two different conditions.
- Condition A: Given antidepressants.
- Condition B: Not given antidepressants.
Harrison asked all the participants to record their mood in a daily diary for a month. He used a rating scale from 1 (happy mood) to 7 (low mood). When he had collected the data, Harrison then calculated an average mood score for each participant over the month.
State a fully operationalised null hypothesis for Harrison's experiment.