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3 weeks ago
In an effort to decide if there is an association between the year of a postal increase and the new postal rate for first class mail, the data were gathered from the United States Postal Service. In 1981, the United States Postal Service changed their rates on March 22 and November 1. This information is shown in the table below.


What is the correlation between year and postal rate?
Textbook 

Stats: Modeling the World


Edition: 4th
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3 weeks ago
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The correlation, r, is r = = 0.9950 . Since the scatterplot shows a positive relationship, the positive value must be used.
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3 weeks ago
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