We want to test the effect of light level and amount of water on the yield of tomato plants. Each potted plant receives one of three levels of light (1 = 5 hours, 2 = 10 hours, 3 = 15 hours) and one of two levels of water (1 = 1 quart, 2 = 2 quarts). The yield, in pounds, is recorded. The results are as follows:
Write a SAS program to read these data and perform a multiple regression. Treat the value of light as interval data using values of 5, 10, and 15. Use values of 1 and 2 for the water levels.
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