document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=882579>Question 882579</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Nondestructive evaluation is a method that is used to<BR>\n" );
document.write( "describe the properties of components or materials without<BR>\n" );
document.write( "causing any permanent physical change to the units. It includes<BR>\n" );
document.write( "the determination of properties of materials and the<BR>\n" );
document.write( "classification of flaws by size, shape, type, and location. This<BR>\n" );
document.write( "method is most effective for detecting surface flaws and characterizing<BR>\n" );
document.write( "surface properties of electrically conductive materials.<BR>\n" );
document.write( "Data were collected that classified each component as<BR>\n" );
document.write( "having a flaw or not, based on manual inspection and operator<BR>\n" );
document.write( "judgment, and the data also reported the size of the crack<BR>\n" );
document.write( "in the material. Do the components classified as unflawed<BR>\n" );
document.write( "have a smaller mean crack size than components classified as<BR>\n" );
document.write( "flawed? The results in terms of crack size (in inches) are<BR>\n" );
document.write( "stored in . (Data extracted from B. D. Olin and W. Q.<BR>\n" );
document.write( "Meeker, “Applications of Statistical Methods to Nondestructive<BR>\n" );
document.write( "Evaluation,” Technometrics, 38, 1996, p. 101.)<BR>\n" );
document.write( "a. Assuming that the population variances are equal, is<BR>\n" );
document.write( "there evidence that the mean crack size is smaller for the<BR>\n" );
document.write( "unflawed specimens than for the flawed specimens? (Use<BR>\n" );
document.write( ")<BR>\n" );
document.write( "b. Repeat (a), assuming that the population variances are<BR>\n" );
document.write( "not equal.<BR>\n" );
document.write( "c. Compare the results of (a) and (b).\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Type	Crack size<BR>\n" );
document.write( "0	0.003<BR>\n" );
document.write( "0	0.004<BR>\n" );
document.write( "0	0.012<BR>\n" );
document.write( "0	0.014<BR>\n" );
document.write( "0	0.021<BR>\n" );
document.write( "0	0.023<BR>\n" );
document.write( "0	0.024<BR>\n" );
document.write( "0	0.030<BR>\n" );
document.write( "0	0.034<BR>\n" );
document.write( "0	0.041<BR>\n" );
document.write( "0	0.041<BR>\n" );
document.write( "0	0.042<BR>\n" );
document.write( "0	0.043<BR>\n" );
document.write( "0	0.045<BR>\n" );
document.write( "0	0.057<BR>\n" );
document.write( "0	0.063<BR>\n" );
document.write( "0	0.074<BR>\n" );
document.write( "0	0.076<BR>\n" );
document.write( "1	0.022<BR>\n" );
document.write( "1	0.026<BR>\n" );
document.write( "1	0.026<BR>\n" );
document.write( "1	0.030<BR>\n" );
document.write( "1	0.031<BR>\n" );
document.write( "1	0.034<BR>\n" );
document.write( "1	0.042<BR>\n" );
document.write( "1	0.043<BR>\n" );
document.write( "1	0.044<BR>\n" );
document.write( "1	0.046<BR>\n" );
document.write( "1	0.046<BR>\n" );
document.write( "1	0.052<BR>\n" );
document.write( "1	0.055<BR>\n" );
document.write( "1	0.058<BR>\n" );
document.write( "1	0.060<BR>\n" );
document.write( "1	0.060<BR>\n" );
document.write( "1	0.070<BR>\n" );
document.write( "1	0.071<BR>\n" );
document.write( "1	0.073<BR>\n" );
document.write( "1	0.073<BR>\n" );
document.write( "1	0.078<BR>\n" );
document.write( "1	0.079<BR>\n" );
document.write( "1	0.079<BR>\n" );
document.write( "1	0.083<BR>\n" );
document.write( "1	0.090<BR>\n" );
document.write( "1	0.095<BR>\n" );
document.write( "1	0.095<BR>\n" );
document.write( "1	0.096<BR>\n" );
document.write( "1	0.100<BR>\n" );
document.write( "1	0.102<BR>\n" );
document.write( "1	0.103<BR>\n" );
document.write( "1	0.105<BR>\n" );
document.write( "1	0.114<BR>\n" );
document.write( "1	0.119<BR>\n" );
document.write( "1	0.120<BR>\n" );
document.write( "1	0.130<BR>\n" );
document.write( "1	0.160<BR>\n" );
document.write( "1	0.306<BR>\n" );
document.write( "1	0.328<BR>\n" );
document.write( "1	0.440<BR>\n" );
document.write( " </SPAN>\n" );
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