Question

5) The placebo effect is particularly strong in patients with Parkinson's disease. To understand the workings of the placebo effect, scientists measure activity levels at a key point in the brain when patients receive a placebo that they think is an active drug and also when no treatment is given. The same 6 patients are measured both with and without the placebo, at different times. The 6 differences of activity levels (treatment minus placebo) had a mean of -1.37 and a standard deviation of 1.02. Do these values indicate that patients have higher activity levels at a key point in the brain with the placebo? Assume the population of activity levels to be normally distributed. Test the claim using a 2% level of significance. (18 points total) Step 1: (4 points) Step 2: (5 points) Step 3: (4 points) Step 4: (2 points) Step 5: (3 points)

Answer 1

Step 1: Ho: Mo=0 . MD = (treatment) (placebo) Hai Moco Step 2 (2%) 2 = 0.02 The level of significan critical value=g (-2.75% ats.(n) Step 3: The test statistic tatlo (1370) (st) VE t= -3.290 Stepy Decision: Reject the hull hypothesis p-value=[0.0109 steps: Conclusion There is significant evidence for the chim that place to effect is particularly V strong in patients with Parkinson's disease.