Two independent random samples have been selected, 100 observations from population 1 and 100 from population
2. Sample means x₁ = 69 and x2 = 54 were obtained. From previous experience with these populations, it is known
that the variances are o² = 81 and 2 = 64. Complete parts a through g below.
Click the icon to view the table of normal curve areas.
a. Find σ(Χ₁ -X2).
σ(Χ₁ - Χ2) = (Round to four decimal places as needed.)