Question

a Brawdy Plastics, Inc., produces plastic seat belt retainers for General Motors at the Brawdy Plastics...

a

Brawdy Plastics, Inc., produces plastic seat belt retainers for General Motors at the Brawdy Plastics 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.

Line
Speed
Number of
Defective
Parts Found
20 24
20 20
30 19
30 17
40 14
40 16
50 14
50 12

a) What does the scatter diagram developed in part (a) indicate about the relationship between the two variables?

There appears to be a positive relationship between line speed (feet per minute) and the number of defective parts.

There appears to be a negative relationship between line speed (feet per minute) and the number of defective parts.    

There appears to be no noticeable relationship between line speed (feet per minute) and the number of defective parts.

(c) Use the least squares method to develop the estimated regression equation.

ŷ =

(d) Predict the number of defective parts found for a line speed of 45 feet per minute.

____

Homework Answers

Answer #1

a)

There appears to be a negative relationship between line speed (feet per minute) and the number of defective parts.    

c)

y^ =27.5-0.3*x

d)

predicted val=27.5+45*-0.3= 14.00 defects
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