(b) What does the scatter diagram developed in part (a) indicate about the relationship between the two variables? 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.     There appears to be a positive 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 25 feet per minute.

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