2. Suppose we have the simple regression model Yi = + Xi+"i and their OLS coecient estimators a and b. Answer the following questions. (a) Suppose we multiply Xi by 1/2 for all i and do the OLS estimation again using 1 2Xi as the regressor (the independent variable). What will be your new estimators, denoted by ~a (intercept) and ~b (slope)? Compare them with the original OLS estimators a and b, respectively (b) Compare V ar[b] and V ar[~b]. Are they the same or di erent? Verify your answer (c) A t-statistic testing H0: = 0 is given by t(b) = b=S:E:(b). Show

You were able to purchase two tickets to an upcoming concert for $100 apiece when the concert was first announced three months ago. recently, you saw that stubhub was listing similar seats for $225 apiece. what does it cost you to attend the concert?

This problem has been solved! see the answercompute and interpret altman's z-scoresfollowing is selected financial information for ebay, for its fiscal years 2005 and 2006.(in millions, except per share data) 2006 2005current assets $ 4,970.59 $ 3,183.24current liabilities 2,518.39 1,484.93total assets 13,494.01 11,788.99total liabilities 2,589.38 1,741.00shares outstanding 1,368.51 1,404.18retained earnings 4,538.35 2,819.64stock price per share 30.07 43.22sales 5,969.74 4,552.40earnings before interest and taxes 1,439.77 1,445.18compute and interpret altman z-scores for the company for both years. (do not round until your final answer; then round your answers to two decimal places.)2006 z-score = answer2005 z-score = answerwhich of the following best describes the company's likelihood to go bankrupt given the z-score in 2006 compared to 2007.the z-score in 2006 is half of the 2005 score. both z-scores are well above the score that represents a healthy company. the z-score in 2006 is double the 2005 score. the z-score has increased sharply, which suggests the company has greatly increased the risk of bankruptcy. the z-score in 2006 is half of the 2005 score. the z-score has decreased sharply, which suggests the company is in financial distress. the z-score in 2006 is double the 2005 score. the z-score has increased sharply, which suggests the company has greatly lowered the risk of bankruptcy.

When the benefit of one particular use of a resource is greater than the opportunity cost, then that resource is which of the following? a. not scarce b. being used efficiently c. a normal good d. non-excludable