Given information
Use the following information to answer the next 
exercises: The U.S. Center for Disease Control reports that the mean life expectancy was 
years for whites born in 
and 
years for nonwhites. Suppose that you randomly survey death records for people born in in a certain county. Of the 
whites, the mean life span was 
years with a standard deviation of 
years. Of the 
nonwhites, the mean life span was 
years with a standard deviation of 
years. Conduct a hypothesis test to see if the mean life spans in the county were the same for whites and nonwhites.
Step-by-step explanation
As the information in the problem suggests that the testing is done to test the mean of the life span, for same and different whites and non-whites.
The parameter which is differing from what it is in the null hypothesis, suggests that it is the two-tailed test.
Therefore, it is a two-tailed test.
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Introductory Statistics
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Chapter
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