Probability and Statistics for Engineering and the Sciences
Key differences between 9th and 8th editions
 Time lapse between current and previous publications: 4 years (2015 vs 2011).
 The principal change in the Ninth Ed. of Devore's Probability and Statistics is the elimination of the rejection region approach. Hypothesis testing is now based on Pvalues. As a result Section 8.1 explains hypotheses and then test procedures based on Pvalues. Also, Chapter 8 has been reorganized.
9th Edition of
Probability and Statistics for Engineering and the Sciences
eBook (digital format), 792 pages
eBook ISBN: 9781305465329
Published by: Cengage Learning, January 01, 2015
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 $33.04 
Hardcover, 792 pages
ISBN10: 1305251806
ISBN13: 9781305251809
Published by: Cengage Learning, January 01, 2015
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 $173.25

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 $194.00 
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$26.47 due: Jun 04
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8th Edition of
Probability and Statistics for Engineering and the Sciences
eBook, 768 pages
eBook ISBN: 9781133169345
Published by: Wadsworth Publishing, February 01, 2013
Book Store  Price 
 Available

 $23.06 
Hardcover, 768 pages
ISBN10: 0538733527
ISBN13: 9780538733526
Published by: Cengage Learning, January 01, 2011
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 $99.50

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7th Edition of
Probability and Statistics for Engineering and the Sciences
Enhanced Review Edition
Hardcover, 752 pages
ISBN10: 0495557447
ISBN13: 9780495557449
Published by: Duxbury Press, January 29, 2008
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 $49.99

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with Student Suite Online
Hardcover, 736 pages
ISBN10: 0495382175
ISBN13: 9780495382171
Published by: Cengage Learning, January 26, 2007
Book Store  New  Used  Rent 
 $59.99

From: $18.99  
Saving advice
Hardcover
 Used 9th edition can save you $99.4 over the new one.

Used previous 8th edition costs $65.42 less than the used 9th.