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A delicatessen is selling 16 ounce containers of potato salad, but a consumer group thinks they are putting less than 16 ounces into them. A random sample of 9 containers finds the following weights: {15.24, 14.82, 15.05, 15.40, 15.55, 15.20, 13.50, 14.50, 15.32} They test at the 2.5% level of significance.