document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=149480>Question 149480</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 15.28 Can people really identify their favorite brand of cola? Volunteers tasted Coca-Cola Classic,<BR>\n" );
document.write( "Pepsi, Diet Coke, and Diet Pepsi, with the results shown below. Research question: At &#945; = .05, is<BR>\n" );
document.write( "the correctness of the prediction different for the two types of cola drinkers? Could you identify<BR>\n" );
document.write( "your favorite brand in this kind of test? Since it is a 2 × 2 table, try also a two-tailed two-sample<BR>\n" );
document.write( "z test for &#960;1 = &#960;2 (see Chapter 10) and verify that z2 is the same as your chi-square statistic.Which<BR>\n" );
document.write( "test do you prefer? Why? (Data are from Consumer Reports 56, no. 8 [August 1991], p. 519.)<BR>\n" );
document.write( "Cola\r<BR>\n" );
document.write( "\n" );
document.write( "Correct?                      Regular Cola	Diet Cola	Row Total<BR>\n" );
document.write( "Yes, got it right	7		7		14<BR>\n" );
document.write( "No, got it wrong	12		20		32<BR>\n" );
document.write( "Col Total		19		27		46<BR>\n" );
document.write( " </SPAN>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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