=+Suppose that you had run the randomized block design from Section 20.4 (see page 728). You would have had two levels of the (blocking) factor NE Corridor (NE or not) and the same four levels of Offer (Coupon, Card, Movie, and No Offer). The ANOVA shows a significant interaction effect between NE Corridor and Offer. Explain what that means. An analysis of the two groups (NE and not) separately shows that for the NE group, the P-value for testing the four offers is 60.0001 but for the not NE group, the P-value is 0.2354. Is this consistent with a significant interaction effect? What would you tell the marketing group?