A sample of 29 paired observations generates the following data:= 1.9 and= 3.8. Assume a normal distribution. UseTable 2.

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

Confidence interval is_____________to ____________.

b.Using the confidence interval, test whether the mean difference differs from zero. choose from A or B

A)There is evidence that the mean difference differs from zero.

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