Question

Short-answer questions (For hypothesis testing questions, I look forward to seeing standard four steps (hypothesis, criteria, calculation, conclusion), loss of any step will result in deduction in grade.) 19) Performance scores on a motor skills task form a normal distribution with μ=20 and σ=4. A psychologist is using this task to determine the extent to which increased self-awareness affects performance. The prediction for this experiment is that increased self-awareness will reduce a subject’s concentration and result in lower performance scores. A sample of n=16 subjects is obtained, and each subject is tested on the motor skills task while seated in front of a large mirror. The purpose of the mirror is to make the subjects more self-aware. The average score for this sample is x̅=15.5. Test the psychologist’s prediction with α=.05. (5 points)

Answer 1