Brews 4 U is a local chain of coffee shops. Managers are interested in the costs of the stores and believe that the regarding customer visits and costs for the preceding year for one of the stores have been entered into the regres 5,500 43,900 Average monthly customer-visits Average monthly total costs Regression results: Intercept b coefficient 688.15 7.64 0.79759 Required: a. In a regression equation expressed as y = a + bx, how is the letter b best described? The letter b is best described as the estimate of the cost for an additional customer visit. The letter b is best described as the observed store cost for a given month. The letter b is best described as the observed customer visits for a given month. b. How is the letter y in the regression equation best described? The letter y is best described as the estimate of the cost for an additional customer visit. The letter y is best described as the observed store cost for a given month. letter y is best described as the observed customer visits for a given month. c. How is the letter x in the regression equation best described? The letter x is best described as the estimate of the cost for an additional customer visit The letter x is best described as the observed store cost for a given month. The letter x is best described as the observed customer visits for a given month. d. Based on the data derived from the regression analysis, what are estimated costs for 380 customer-visits in a mor Estimated cost