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In an effort to decide if there is an association between the year of a postal increase and the new ...

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In an effort to decide if there is an association between the year of a postal increase and the new ...

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.

Make a scatterplot and describe the association between the year and the first class postal rate.

Textbook

Stats: Modeling the World

Edition: 4^th

Authors: Bock, Velleman, De Veaux

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