The following sample observations were randomly selected. (Round your answers to 2 decimal places.) X: Y: 4 8.8 5 12.6 3 8 6 15.4 10 19.6 a. The regression equation is = + X b. When X is 6 this gives = Bi-lo Appliance Super-Store has outlets in several large metropolitan areas in New England. The general sales manager aired a commercial for a digital camera on selected local TV stations prior to a sale starting on Saturday and ending Sunday. She obtained the information for Saturday-Sunday digital camera sales at the various outlets and paired it with the number of times the advertisement was shown on the local TV stations. The purpose is to find whether there is any relationship between the number of times the advertisement was aired and digital camera sales. The pairings are: Location of TV Station Providence Springfield New Haven Boston Hartford Number of Airings 4 2 5 6 3 Saturday-Sunday Sales ($ thousands) 15 8 21 24 17 Click here for the Excel Data File a. What is the dependent variable? is the dependent variable. (Click to select) c. Determine the correlation coefficient. (Round your answer to 2 decimal places.) Coefficient of correlation d. Interpret these statistical measures. The statistical measures obtained here indicate correlation between the variables (Click to select) Pennsylvania Refining Company is studying the relationship between the pump price of gasoline and the number of gallons sold. For a sample of 20 stations last Tuesday, the correlation was .78. At the .01 significance level, is the correlation in the population greater than zero? (Round your answer to 3 decimal places.) The test statistic is Decision: . H0: 0 (Click to select)