Question 1074976
let u(1) be the average age for US individual at death
let u(2) be the average age for German individual at death
:
1)  Ho:  u(1) - u(2) = 0
2)  H1:  u(1) - u(2) not = 0
3)  Z since both samples' sizes are > 30
:
u = (77.7 - 76.5) = 1.2
:
std. dev = square root( (4.8^2 / 205) + (4.3^2 / 255) ) = 0.43
:
4)  Z-value = 1.2 / 0.43 = 2.791
:
5)  p-value = (1 - 0.9974) * 2 = 0.005
:
6)  p-value is < 0.01, therefore we reject Ho and answer is YES
: