To determine whether the bacteria count was lower in the west basin of Lake Macatawa
Chapter 7, Problem 7.1-6(choose chapter or problem)
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 x = 11.95 and s = 11.80, measured in hundreds of colonies. Find an approximate 95% confidence interval for the mean number of colonies (say, W) in 100 milliliters of water in the west basin.
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