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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.

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 order over 1 year. Are the main effects significant? Is there an interaction? Deliveries2
Supplier 1 Supplier 2 Supplier 3
Qtr 1 12 10 16
15 13 13
11 11 14
11 9 14
Qtr 2 13 10 14
11 10 11
13 13 12
12 11 12
Qtr 3 12 11 13
8 9 8
8 8 13
13 6 6
Qtr 4 8 8 11
10 10 11
13 10 10
11 10 11

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 order over 1 year. Are the
main effects significant? Is there an interaction? Deliveries2
Supplier 1 Supplier 2 Supplier 3
Qtr 1 12 10 16
15 13 13
11 11 14
11 9 14
Qtr 2 13 10 14
11 10 11
13 13 12
12 11 12
Qtr 3 12 11 13
8 9 8
8 8 13
13 6 6
Qtr 4 8 8 11
10 10 11
13 10 10
11 10 11

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