Brawdy Plastics, Inc., produces plastic seat belt retainers for General Motors at their plant in Buffalo, New York. After final assembly and painting, the parts are placed on a conveyor belt that moves the parts past a final inspection station. How fast the parts move past the final inspection station depends upon the line speed of the conveyor belt (feet per minute). Although faster line speeds are desirable, management is concerned that increasing the line speed too much may not provide enough time for inspectors to identify which parts are actually defective. To test this theory, Brawdy Plastics conducted an experiment in which the same batch of parts, with a known number of defective parts, was inspected using a variety of line speeds. The following data were collected. Excel file: data14-05.xlsx If required, enter negative values as negative numbers. a. Select a scatter diagram with the line speed as the independent variable. A. Number of Defective Parts 25- 20 15 10 -10 -5 5 10 15 20 25 30 35 40 45 50 55 -5 Line Speed (feet per minute -10 Line Speed 20 Number of Defective Parts Found 23 20 21 30 19 30 16 40 15 40 17 50 14 50 11 B. -10 25 25 Number of Defective Parts 20 15 10 5 -5 5 10 15 20 25 30 35 40 45 50 55 55 C. -10 -10 -5 Line Speed (feet per minute) 25 25 Number of Defective Parts -20 15 10 -10 -10 10 15 20 25 30 35 40 45 Line Speed (feet per minute) 50 50 55 D. 25 Number of Defective Parts -10 -20 15 10 -10 10 15 20 25 30 35 40 45 50 55 Line Speed (feet per minute Select your answer- b. What does the scatter diagram developed in part (a) indicate about the relationship between the two variables? Select your answer- c. Use the least squares method to develop the estimated regression equation (to 1 decimal). + d. Predict the number of defective parts found for a line speed of 25 feet per minute.