The placebo effect is particularly strong in patients with Parkinson\'s disease.

Question

The placebo effect is particularly strong in patients with Parkinson's disease. To understand the workings of the placebo effect, scientists measure activity 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 six patients are measured both with and without the placebo, at different times. The six differences (treatment minus control) had = -0.343 and s = 0.167.

The value of the t statistic (±0.01) is .

Is there significant evidence of a difference between treatment and control? No Yes

Explanation / Answer

Hi! I assumed that the mean difference is d = -0.343, as it is the missing given.

Here,

t = d*sqrt(n)/s = -0.343*sqrt(6)/0.167 = -5.03 [ANSWER]

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As df = n - 1 = 6 - 1 = 5, then we see that the P value is, by technology, using one tailed test,

Pvalue = 0.001998733

As this is very small Pvalue, then YES, THERE IS SIGNIFICANT DIFFERENCE. [ANSWER. YES]

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