A company has several suppliers of office supplies. It receives several shipments each quarter from each supplier. The time (days) between order and delivery was recorded for several randomly chosen shipments from each supplier in each quarter, and an ANOVA was performed. 

(a) What kind of ANOVA is this (one-factor, two-factor, etc.)?

(b) How many suppliers were there? How many quarters? How many observations per supplier per quarter? Explain how you know.
(c) At α = .01, what are your conclusions about shipment time? Explain, referring either to the F tests or p-values.

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ANOVA Source of Variation SS df MS F p-value Fcit Quarter Supplier Interaction Within 148.04 3 49.34667 6.0326 0.0009 2.7188 410.14 4 102.535 2.5348 0.0000 2.4859 247.06 2 20.5883 2.5169 0.0073 18753 654.40 80 8.180 Total 1459.64 99