A clinical psychologist investigated the nightly sleep duration (in hours) of patients diagnosed with Generalized Anxiety Disorder (GAD) compared to a control group of healthy individuals over a three-week period.
The psychologist calculated the standard deviation for the nightly sleep duration of the group with GAD and found it to be 0.45.
They found a standard deviation of 1.85 for the nightly sleep duration of the control group.
Interpret what these two standard deviations tell us about the results.
82 exam-style questions on Edexcel A Level Psychology Research methods and skills, covering Research methods and skills. Each one has a worked solution and a mark scheme showing where the marks go.