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.
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.
