A sociologist, Sal Sociological, wants to determine if the life expectancy of people in Africa is less than the life expectancy of people in Asia. He collects data from a sample of individuals and the resulting data is shown below. Calculate a 95% confidence interval for the difference in life expectancy between Africa and Asia.
Africa:= 56.3 years
S1= 8.1 years
n1 = 53
Asia: = 66.2 years
S2 = 9.3 years
n2 = 42