(1 point) Two independent samples have been selected, 6464 observations from population 1 and 8181 observations from population 2. The sample means have been calculated to be x¯¯¯1=14.8x¯1=14.8 and x¯¯¯2=5.9x¯2=5.9. From previous experience with these populations, it is known that the variances are σ21=28σ12=28 and σ22=36σ22=36.