In a study conducted by the Water Resources Center and
Chapter , Problem 6.96(choose chapter or problem)
In a study conducted by the Water Resources Center and analyzed by the Statistics Consulting Center at Virginia Tech, two different wastewater treatment plants were compared. Plant A is located where the median household income is below $22,000 a year, and plant B is located where the median household income is above $60,000 a year. The amount of wastewater treated at each plant (thousands of gallons/day) was randomly sampled for 10 days. The data are as follows: Plant A: 21 19 20 23 22 28 32 19 13 18 Plant B: 20 39 24 33 30 28 30 22 33 24 Can we conclude, at the 5% level of significance, that the average amount of wastewater treated at the plant in the high-income neighborhood is more than that treated at the plant in the low-income area? Assume normality.
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