The following data give the experience of machine operators and their performance nce ratings as given by the number of good parts turned out per 100 pieces. 9. Operator Еxperience (X) 2 3 4 5 16 12...

Extracted text: The following data give the experience of machine operators and their performance nce ratings as given by the number of good parts turned out per 100 pieces. 9. Operator Еxperience (X) 2 3 4 5 16 12 18 4 3 10 12 Performance 68 78 80 75 83 Ratings (Y) Calculate the regression line of performance ratings on experience and estimate the probable perfor- mance if an operator has 7 years' experience. 87 88 89