The 95% confidence interval for a collection of paired sample data is 0.0 < d < 1.2.

Question:

The 95% confidence interval for a collection of paired sample data is 0.0 < μd < 1.2. Based on this confidence interval, the traditional method of hypothesis testing leads to the conclusion that the claim of μd > 0 is supported. What is the smallest possible value of the significance level of the hypothesis test?