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I have few questions: For sub-problem 2, on the predictions parts, why the formulas are exactly the same but one with interval=prediction, and the other

I have few questions:

For sub-problem 2, on the predictions parts, why the formulas are exactly the same but one with interval="prediction", and the other one with "confidence"

when I run this Chunk, I get the following warning: Warning: 'newdata' had 1 row but variables found have 414 rows

Can you please assist on that please?

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