Redo problem 9.1 using dummy variables for light levels and water amounts. For the three light levels, use the 5-hour value as your reference Problem 9.1 We want to test the effect of light level and...

Redo problem 9.1 using dummy variables for light levels and water amounts. For the three light levels, use the 5-hour value as your reference

Problem 9.1

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.