The accompanying data file contains information on matched sample observations whose differences are normally distributed. (You WipictureClick here for the Excel Data File Let the difference be defined as Sample 1 - Sample 2. a. Construct the 99% confidence interval for the mean difference 0. (Negative value should be indicated by a minus sign. Round final answers to 2 decimal places.) The accompanying data file contains information on matched sample observations whose differences are normally distributed. (You WipictureClick here for the Excel Data File Let the difference be defined as Sample 1 - Sample 2. a. Construct the 99% confidence interval for the mean difference 0. (Negative value should be indicated by a minus sign. Round final answers to 2 decimal places.)