Refer to Exercise 13.58. Suppose that we wished to modify our nine-variable model to allow for the possibility that the relationship between PRICE and AGE differs depending on the number of bedrooms.
a. Formulate such a model.
b. What combination of model parameters represents the difference between a five- bedroom, one- garage home and a two- bedroom, two- garage home?
In exercise

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Property PRICE BATHS BEDA BEDB卫RDC CARA CA R AGE 23 7 1.0 1.0 2.5 LOTDOM 164 25750 37950 46450 46550 2.5 47950 49950 52450 54050 20 9680 1889 9 1941 315 61 234 116 162 80 1 8 1.5 1.5 2.5 1813 1583 1533 1667 5 3450 10 po 6 4 2 3 5 3 3 7 31113 13225222152222 0q00-000000000 00000010010011 0200040000 040 42430, 0 3 2 9 210 7 901234567890-2