The manager of a dairy is in the process of deciding which of two new carton-filling machines to use. The most important attribute is the consistency of the fills. In a preliminary study she measured the fills in the 1-liter carton and listed them here. Can the manager infer that the two machines differ in their consistency offills?

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Machine 1 .998 997 1.003 1.000 .999 1.000 .998 1.003 1.004 1.000 Machine 2 1.003 1.004 .997 996 .999 1.003 1.000 1.005 1.002 1.004 .996