<PRE><B>Question 518740</B>
Assume the number of gallons sold follows the normal distribution with a standard deviation of 3 gallons. From his records, he selects a random sample of 63 sales and finds the mean number of gallons sold is 8.73.
The 99 percent confidence interval for the population mean is between?
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sample mean: 8.73
margin of error: 2.58*3/sqrt(63) = 0.98
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99%CI: 8.73-0.98 &lt; u &lt; 8.73+0.98
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Cheers,
Stan H.
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