I can methodically work through the various sums of squares to get to the end point, but this is not intuitive. If you asked what was the difference between the total sum of squares and the sum of squares due to the regression, for instance, I'd draw a blank. I can look at the formulas to figure it out, but it isn't committed to memory.
Ted: Keep in mind that the total sum of squares is just N times the variances of Y. SSR is variation in the predicted value.
I was glad you didn't cold call on me. I am not normally shy in class to volunteer but if cold called in a math class, my brain tends to freeze (unless I've had time to think about it sufficiently first).
Ted: I want to stress that it is fine to say "pass". I just want to get a sense of general comprehension in the class as a whole, not specific individuals. I have the feeling that when the average student doesn't understand something in a stats course he/she remains silent. Asking questions is a way to get a sense of the level of understanding. If many of the students in the class are scared of me calling on them, let's discuss this in class (feel free to bring it up).

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