Problem 27
Page 556
Section: PRACTICE
Chapter 10: HYPOTHESIS TESTING WITH TWO SAMPLE
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 test statistic and 
value are found in the previous problem,
The following is the required graph:
with the horizontal axis, the hypothesized difference, and the sample difference marked. And the area corresponding to the value shaded.
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