Problem 28
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
In order to find the 
value press 'STAT' and 
twice to select TESTS.
Then,
Select the 
sample 'T-test' and press 'ENTER' as shown below,
Use , then select 'Stats' and enter the provided sample values.
Once all the sample entries are filled, press 'ENTER' to obtain the results as follows:
From the above output, the 
is 
which is approximately equal to 
.
Therefore,
is approximately equal to .
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Introductory Statistics
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