Brawdy plastics, inc., produces plastic seat belt retainers for general motors at in buffalo, new york. after final assembly and painting, the parts are placed on a com belt that moves the parts past a final inspection station. how fast the parts move final inspection station depends upon the line speed of the conveyor belt (feet per minue although faster line speeds are desirable, management is concerned that increasing speed too much may not provide enough time for inspectors to identify which parts ally defective. to test this theory. brawdy plastics conducted an experiment in which the batch of parts, with a known number of defective parts, was inspected using a variety of ling speeds. the following data were collected. 5. their plan sume
col1line speed 20 20 30 30 40 40 50 50
col2 number of defective parts found 23 21 19 16 15 17 14
a. develop a scatter diagram with the line speed as the independent variable.
b. what does the scatter diagram developed in part (a) indicate about the relationsiu between the two variables?
c. use the least squares method to develop the estimated regression equation.
d. predict the number of defective parts found for a line speed of 25 feet per minuie