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Unformatted text preview: ENME 392 Fall 2009  Statistical Methods for Product and Process Development NAME____________________ Tues Thurs: Section 0101 11:0012:15 room EGR 2107; Section 0201 9:3010:45 room ANS 0408 Prof. D. B. Barker, room 2112 ENG, (301) 4055264, dbarker@umd.edu SECTION ___________________ 10/1/09 page 1 Quiz #2 Open Book & Open Notes 1. The tensile strength of two alloys A and B are being compared. It is known that the two standard deviations are equal at 5 kpsi each. 30 samples of each alloy are tested and the results are 5 . 49 = A x kpsi and 5 . 45 = B x kpsi. The manufacturers of alloy A are convinced that this shows conclusively that A > B . Manufacturers of alloy B claims things are inconclusive and that the two alloy populations have the same mean. Compose an argument that manufactures of alloy B are wrong. Do it by computing )  4 ( B A B A X X P = > and explain the conclusions from your calculations = > = > = + > = = = = ) 098 . 3 ( )) 15 / 5 /(...
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This note was uploaded on 02/27/2010 for the course ENME 271 taught by Professor Marks during the Spring '08 term at Maryland.
 Spring '08
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