The marketing manager of a large supermarket chain would like to use sheif space to predict the sales of pet food. A random sample of 12 equal-sized stores is selected. The sheif space (X) and sal in dollars (Y) are observed. a. Is it necessary to compute the Durbin-Watson statistic in this case? Explain b. Under what circumstances is it necessary to compute the Durbin-Watson statistio before proceeding with the least-aquares method of regression analysis? a. Select the correct answer below. OA Yes, itis always necessary to compute the Durbin-Watson statistic. OB. No, because the data were not collected over time C. Yes, because the number of observations is sufficiently amal that autocorrelation is a concem. OD. No, because the number of observations is sufficiently small that autocomrelation is not a concem

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