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Example 126


Example 126: In 1980, the average time to complete a “four-year” degree was 4.9 years.  In 2006, a study of 31 randomly selected students had an average completion time for their four-year degree of 5.3 years with a population standard deviation of 1 year.  Use the p-value method to test the claim that the mean time to complete a four-year degree is now more than 4.9 years. 


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