A sample of 20 paired observations generates the following

Question

A sample of 20 paired observations generates the following data:  = 1.3 and  = 2.6. Assume a normal distribution. Use Table 2.

a. Construct the 90% confidence interval for the mean difference μ_D. (Round all intermediate calculations to at least 4 decimal places and final answers to 2 decimal places.)

b. Using the confidence interval, test whether the mean difference differs from zero.

a.  There is evidence that the mean difference differs from zero.

b. There is no evidence that the mean difference differs from zero.