Posted by **WEB** on Saturday, November 5, 2011 at 10:42pm.

A doctor at a local hospital is interested in estimating the birth weight of infants. How large a sample must she select if she desires to be 98% confident that the true mean is within 2 ounces of the sample mean? The standard deviation of the birth weights is known to be 5 ounces.

A) 34

B) 5

C) 33

D) 6