Oxnard Petro, Ltd., has three suppliers of catalysts. Orders are placed with each supplier every 15 working

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Oxnard Petro, Ltd., has three suppliers of catalysts. Orders are placed with each supplier every 15 working days, or about once every 3 weeks. The delivery time (days) is recorded for each Deliveries2 order over 1 year. Are the main effects significant? Is there an interaction?
Oxnard Petro, Ltd., has three suppliers of catalysts. Orders are
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