A treatment plant that sends effluent into the river claims the mean suspended solids is never above 40 mg/l. Measurements of the suspended solids in river water on n = 14 Monday mornings yield x (x bar) = 46 and s = 9.4 mg/l. Based on data collected over a period of many years, it is reasonable to assume that the individual measurements follow a normal distribution. Do the data support or refute the treatment plant’s claim?
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