a. Assume that this is the correct equation. What is the mean value of y when x1 = 10, x2 = .5, x3 = 50, and x4 = 100?
b. What mean error percentage is associated with a backlight level of 20, character subtense of .5, viewing angle of 10, and ambient light level of 30?
c. Interpret the values of b2 and b3.
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