.A variable of two populations has a mean of 33.6 and a standard deviation of 16 for one of the populations and a mean of 33.6 and a standard deviation of 29.2 for the other population For independent samples of size 6067 and 4151, respectively find the moon and standard devintion of x1-x2,- The mean of Hy is (Type an integer or a decimal The standard deviation of x1 - x2 ) (Round to four decimal places as needed