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What is the root mean squared error of a line with slope 0 and...

What is the root mean squared error of a line with slope 0 and intercept of the mean of y equal to?

Hint 1: The line with slope 0 and intercept of mean of y is just a straight horizontal line at the mean of y

Hint 2: What does the formula for RMSE become if we input our predicted y values in the formula. Try writing it out on paper! It should be a familiar formula.

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