document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1050344>Question 1050344</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 1. A total of 12 subjects are randomly assigned, in equal numbers, to the<BR>\n" );
document.write( "committee condition ( X 1 ) and to the solitary condition ( X 2 ). A compliance<BR>\n" );
document.write( "score is obtained for each subject. Use t to test the null hypothesis at the<BR>\n" );
document.write( ".05 level of significance.\r<BR>\n" );
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document.write( "2. To determine whether training in a series of workshops on creative thinking<BR>\n" );
document.write( "increases IQ scores, a total of 70 students are randomly divided into<BR>\n" );
document.write( "treatment and control groups of 35 each. After two months of training,<BR>\n" );
document.write( "the sample mean IQ ( – X1) for the treatment group equals 110, and the<BR>\n" );
document.write( "sample mean IQ ( – X2) for the control group equals 108. The estimated<BR>\n" );
document.write( "standard error equals 1.80.\r<BR>\n" );
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document.write( "(a) Using t , test the null hypothesis at the .01 level of significance.\r<BR>\n" );
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document.write( "(b) If appropriate (because the null hypothesis has been rejected), estimate<BR>\n" );
document.write( "the standardized effect size, construct a 99 percent confidence interval<BR>\n" );
document.write( "for the true population mean difference, and interpret these estimates.\r<BR>\n" );
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document.write( "3.Assume that on average, healthy young adults dream 90 minutes each<BR>\n" );
document.write( "night, as inferred from a number of measures, including rapid eye movement<BR>\n" );
document.write( "(REM) sleep. An investigator wishes to determine whether drinking<BR>\n" );
document.write( "coffee just before going to sleep affects the amount of dream time. After<BR>\n" );
document.write( "drinking a standard amount of coffee, dream time is monitored for each of<BR>\n" );
document.write( "28 healthy young adults in a random sample. Results show a sample<BR>\n" );
document.write( "mean, X, of 88 minutes and a sample standard deviation, s , of 9 minutes.<BR>\n" );
document.write( "(a) Use t to test the null hypothesis at the .05 level of significance.<BR>\n" );
document.write( "(b) If appropriate (because the null hypothesis has been rejected), construct<BR>\n" );
document.write( "a 95 percent confidence interval and interpret this interval.\r<BR>\n" );
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document.write( "4. In the gas mileage test described in this chapter, would you prefer a<BR>\n" );
document.write( "smaller or a larger sample size if you were<BR>\n" );
document.write( "(a) the car manufacturer? Why?<BR>\n" );
document.write( "(b) a vigorous prosecutor for the federal regulatory agency? Why?\r<BR>\n" );
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document.write( "4. Even though the population standard deviation is unknown, an investigator<BR>\n" );
document.write( "uses z rather than the more appropriate t to test a hypothesis at<BR>\n" );
document.write( "the .05 level of significance.<BR>\n" );
document.write( "(a) Is the true level of significance larger or smaller than .05?<BR>\n" );
document.write( "(b) Is the true critical value larger or smaller than that for the critical z ? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #666104 by </B><A HREF=/tutors/aboutme.mpl?userid=ikleyn><B>ikleyn(52781)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ikleyn><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=ikleyn><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=666104\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> .<BR>\n" );
document.write( "I am sure nobody will even read it.\r<BR>\n" );
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document.write( " </SPAN>\n" );
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