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In a manufacturing process the assembly line speed (feet per Minute) was thought to affect the number of defective parts found during the inspection process. To test this theory, management devised a situation where the same batch of parts was inspected visually at a variety of line speeds. The following data were collected
Line Speed Number of Defective
Parts Found
20 21 20 19 40 15 30 16 60 14 40 17
a. Develop a scatter diagram.
b. Show correlation at the 0.05 significance level.
c. Develop the regression line for the data.
d. Add the regression line to your scatter diagram.
e. What number of defectives would you expect to be found at a line speed of 50?
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