An Additive regression model for the Apple prices is:

a) What is the name for the kind of variable called Jan in this model?
b) Why is there no predictor variable for December?

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ariabl Coefficient SE (Coeff) t-ratio P-value Intercept 114.825 29.46 Time Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov -3.90 0.0004 3.94 0.0004 -0.001438 0.0783 0.018 0.9855 -0.007062 0.0783-0.090 0.9287 0.046 0.9634 0.192 0.8488 0.749 0.4592 1.47 0.1501 2.21 0.0342 2.16 0.0383 0.624 0.5368 0.078 0.9381 -0.014249 0.0847 -0.168 0.8675 0.057746 0.0147 0.003626 0.0784 0.015064 0.0784 0.058751 0.0785 0.115689 0.0786 0.173627 0.0787 0.169815 0.0788 0.049253 0.0789 0.006191 0.0791