Question: Why the change? b) Find a 95% confidence interval for the coefficient of SAT. How does it compare with the one you found in Exercise

Why the change?

b) Find a 95% confidence interval for the coefficient of SAT.

How does it compare with the one you found in Exercise 13?

c) The t-ratio associated with the SAT coefficient is now much smaller and the corresponding P-value much larger. Explain why this has happened

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