<PRE><B>Question 448797</B>
The cellular spinoff company Jog wants to estimate the proportion of households that would purchase an additional cellular line if it were made available with a free handset. A random sample of 500 accounts is selected. The results indicate that 135 of the accounts would purchase an additional line if the handset was free. 
Q-5a: Construct a 99% confidence interval estimate of the population proportion of accounts that would purchase the additional line if the handset were free.

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p-hat = 135/500 = 0.27
ME = 2.5758*sqrt[0.27*0.73/500] = 0.0511
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99% CI: 0.27-0.05 &lt; p &lt; 0.27+0.25
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Cheers,
Stan H. </PRE>