Interpret the meaning of the coefcient for closing price. Does closing price have a practical significance? Is it statistically signicant for predicting competitiveness of auctions? (Use a 13% signicance level.) Use stepwise selection (use function step() in the stats package or function stepAICU in the MASS package) and an exhaustive search (use function glmulti{} in package glmulti) to nd the model with the best fit to the training data. TLf'ti'l'lich predictors are used? Use stepwise selection and an exhaustive search to find the model with the lowest predictive error rate [use the validation data}. Which predictors are used? 1What is the danger of using the best predictive model that you found? Explain why the bestfitting model and the best predictive models are the same or different. If the major objective is accurate classication, what cutoff value should be used? Based on these data, what auction settings set by the seller (duration, opening price, ending day, currency) would you reconrunend as being most likely to lead to a competitive auction