Question: Use the data in CHARITY.RAW to answer the following questions: (i) Estimate the equation gift = (0 + (1 mailsyear + (2 giftlast + (3

Use the data in CHARITY.RAW to answer the following questions:
(i) Estimate the equation
gift = (0 + (1 mailsyear + (2 giftlast + (3 propresp + u
by OLS and report the results in the usual way, including the sample size and R-squared. How does the R-squared compare with that from the simple regression that omits giftlast and propresp?
(ii) Interpret the coefficient on mailsyear. Is it bigger or smaller than the corresponding simple regression coefficient?
(iii) Interpret the coefficient on propresp. Be careful to notice the units of measurement of propresp.
(iv) Now add the variable avggift to the equation. What happens to the estimated effect of mailyear?
(v) In the equation from part (iv), what has happened to the coefficient on giftlast? What do you think is happening?

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i The estimated equation is The R squared is now about 083 compared with about 014 for the simple re... View full answer

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