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Statistics - Critical Value

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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:Sample mean 55.3,Population standard deviation 8.1, sample size 53

Asia: Sample mean 65.3, Population standard deviation 9.3, sample size 42

Calculate the critical value. Use a=0.05

a) -2.33 b)-2.58 c)-1.96 d) -1.65

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The expert determines the critical value for sociologists. Step-wise solution is provided.

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