Homework Soursesociologist wants to determine if the life expectancy of peo
sociologist wants to determine if the life expectancy of people in Africa is less than the life expectancy of people in Asia. The data obtained is shown in the table below.
What is an appropriate null hypothesis?
H0: 1 2
H0: 1 > 2
H0: 1 < 2
H0: 1 = 2
| Africa | Asia |
| Xbar1 = 63.3 yr. | Xbar2 = 65.2 yr. |
| 1 = 9.1 yr. | 2 = 7.3 yr. |
| n1= 120 | n2 = 150 |
Solution
H0: 1 = 2
(null hypothesis always has equality)
