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Jim Rutherford (510) 242-3410 jaru@chevrontexaco

Cat C13 Pre-Matrix Data Analyses Update #2 Presented to C13 Task Force Teleconference February 11, 2005. Jim Rutherford (510) 242-3410 jaru@chevrontexaco.com. Summary. Five tests with two oils in an assortment of labs. Simple t-tests for most of the result variables.

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Jim Rutherford (510) 242-3410 jaru@chevrontexaco

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  1. Cat C13Pre-Matrix Data AnalysesUpdate #2Presented to C13 Task ForceTeleconference February 11, 2005 Jim Rutherford (510) 242-3410 jaru@chevrontexaco.com

  2. Summary • Five tests with two oils in an assortment of labs. • Simple t-tests for most of the result variables. • ATGC, ATLC, and TGA_H500 had significant (p<0.05) oil differences • OCONPINC, TGFAVG, and FEWMH500 had marginally significant (0.05<p<0.10) oil differences • Adding sixth test from Caterpillar didn’t change much. • The only test for oil difference that changed substantially was IRINH500 – strange result. Looks like different units for some measurements. • If this test continues and it has averages over cylinders we will probably have to have cylinder outlier procedures. • After outlier screening, oil difference for TGF is no longer significant. • ALSCT oil difference is significant with or without outlier screening. • ALSCI and ALSCO did not have significant oil differences Cat C13 Pre-Matrix 2

  3. Data in pre-matrix dataset Cat C13 Pre-Matrix 2

  4. Data in pre-matrix dataset with Cat test ALSCT corrected Cat C13 Pre-Matrix 2

  5. Data in pre-matrix dataset with Cat test deleted Cat C13 Pre-Matrix 2

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