9.4 Electricity prices According to the U.S. Energy Information Administration, the average monthly household electricity bill in

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9.4 Electricity prices According to the U.S. Energy Information Administration, the average monthly household electricity bill in 2014 was $114 before taxes and fees. A consumer association plans to investigate if the average amount has changed this year. Define the population parameter of interest and state the null and alternative hypotheses for this investigation.

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Statistics The Art And Science Of Learning From Data

ISBN: 9781292164878

4th Global Edition

Authors: Alan Agresti, Christine A. Franklin, Bernhard Klingenberg

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