To determine whether the bacteria count was lower in the west basin of Lake Macatawa than in the east basin, n = 37 samples of water were taken from the west basin and the number of bacteria colonies in 100 milliliters of water was counted. The sample characteristics were = 11.95 and s = 11.80, measured in hundreds of colonies. Find an approximate 95% confidence interval for the mean number of colonies (say, μW) in 100 milliliters of water in the west basin.