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Two way ANOVA for catalysts delivery time

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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 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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Solution Summary

The solution provides step by step method for the calculation for two way ANOVA. Formula for the calculation and Interpretations of the results are also included. Interactive excel sheet is included. The user can edit the inputs and obtain the complete results for a new set of data.

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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 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
Answer
Hypothesis 1
H01: There is no significant difference in the mean delivery time among 3 suppliers.
H11: There is significant difference in the mean delivery time among 3 ...

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