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A researcher performs a hypothesis test to test the claim that for a particular manufacturer, the mean weight of cereal in its 18 ounce boxes is less than 18 ounces. The computer display is shown below. Using a significance level of 0.05, what is your conclusion from these data?

N MEAN STDEV SE MEAN T P VALUE
weight 21 17.883 0.212 0.0463 -2.53 0.01

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