A stratified random sample of size 120 is to be drawn from the population. The sizes of the samples from the three strata under proportional allocation scheme are respectively:
A. 30, 40, 50
B. 30, 45, 45
C. 20, 40, 60
D. 50, 40, 30
Answer:B
A stratified random sample of size 120 is to be drawn from the population. The sizes of the samples from the three strata under proportional allocation scheme are respectively:
A. 30, 40, 50 B. 30, 45, 45 C. 20, 40, 60 D. 50, 40, 30