document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=324784>Question 324784</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The lifetime of a certain brand of battery is known to have a standard deviation 16 of  hours. Suppose that a random sample of 80 such batteries has a mean lifetime of  43.5 hours. Based on this sample, find a 90% confidence interval for the true mean lifetime of all batteries of this brand. Then complete the table below. \r<BR>\n" );
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document.write( "Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place.<BR>\n" );
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