SOLUTION: A 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.

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Question 321504: A 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.
Africa
X 63.3
σ 9.1
n 120
Asia
X 65.2
σ 7.3
n 150
What is the null hypothesis? Use α = 0.05.
Am I right in saying the null hypothesis is Ho: u1 = u2 or is it Ho: u1 >_ u2

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