A population consists of two strata, h and L, of sizes 100,000and 500,000 and standard deviations 20 and 12, respectively. A Stratified sample of size 100 is to be taken.

a) Find the optimal allocation for estimating the populationmean

b) Find the optimal allocation for estimating the differenceof the means of the strata,μH-μL.

x = ± 6i

step-by-step explanation:

x^2 = -36

take the square root of each side

sqrt(x^2) = sqrt(-36)

we know sqrt(ab) = sqrt(a) sqrt(b)

x = ±sqrt(36) sqrt(-1)

we know that sqrt (-1) = i

x = ± 6i

fist on the left goes with the third on the right. second on the left goes with the fourth on the right. third on the left goes with the second on the right. the fourth on the left goes with first on the right