12.45 The yield percentage Y of a chemical process depends on the temperature at which the process is run and the length of time the process is active. For two levels of temperature and two lengths of time, the yields are listed in table below (with two observations per treatment):

a Perform an analysis of variance, testing first for interaction. Use .
b If interaction is significant, construct confidence intervals on the six possible differences between treatment means, using a simultaneous confidence coefficient of approximately 0.90.

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Temperature Time Low High 24 28 Low 45 30 26 23 High 28 22