An extended study is being designed to sample the release of estrogens into the environment from a hog farrowing farm in North Carolina. An initial set of samples (n = 6) showed that
the %RSD of analysis was 15.3%, for an average estrogen level of 133.5 ng/L in sediment outside of the barn. How many samples will need to be taken to reduce the variance to under a value of 200, if it is assumed that the average estrogen level will remain the same?