The two data sets in the table below are dependent random samples. The population of (x - y) differences is approximately normally distributed. X 51 58 62 56 63 57 65 y 25 31 28 33 26 36 34 For all three parts below, round your answers to 3 places after the decimal point, if necessary (a) Find the value of d . d = (b) Find the value of sd. Sd= (c) Construct a 90% confidence interval for the mean difference. If it is not appropriate to construct a confidence interval in this situation, then enter "0" in both answer boxes below. 90% confidence interval