A few stat intro questions

Q1:

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1) What are the value(s) of A and B)?
2) How to interpret the regression estim. of the intercept?

3) How is the quality of fit?

Q2:

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Is the answer 1537?

Q3:

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Having a little trouble with this one, can anyone help out?

Thanks!

gretal said:

Q1: <link removed>

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Please reply with the typed-out text of the exercise, the complete instructions, and a detailed description of any other content (such as a graph), along with a clear statement of your thoughts and efforts so far. Thank you!