1) Consider the following dataset with 4 observations for X and Y. Answer the questions below. Use the blank rows and columns in the table for the required intermediate calculations and label your added rows & columns so I know what you are doing. (5 points) X Y H 15 5 13 8 5 10 3 a) Write the formula for the mean of X. Calculate MEANS OF X AND Y. b) Write the formula for the the variance of X. Calculate the SAMPLE VARIANCE OF X AND THE SAMPLE VARIANCE OF Y. c) Write the formula for the SAMPLE COVARIANCE of X and Y and calculate it. d) Write the formula for the slope of the regression of Y against X and calculate it. e) Find the intercept of this regression