document.write( "Question 1154416: A publisher wants to estimate the mean length of time (in minutes) all adults spend reading newspapers. To determine this estimate, the publisher takes a random sample of 15 people and obtains the results below. From past studies, the publisher assumes sigma is 2.2 minutes and that the population of times is normally distributed. \n" );
document.write( "6 \n" );
document.write( "11 \n" );
document.write( "6 \n" );
document.write( "6 \n" );
document.write( "11 \n" );
document.write( "6 \n" );
document.write( "11 \n" );
document.write( "7 \n" );
document.write( "7 \n" );
document.write( "12 \n" );
document.write( "8 \n" );
document.write( "9 \n" );
document.write( "8 \n" );
document.write( "10 \n" );
document.write( "8 \n" );
document.write( " \n" );
document.write( "Construct the 90% and 99% confidence intervals for the population mean. Which interval is wider? \n" );
document.write( "
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