The following table gives the distribution of items of production and also tne relatively defective items among them, according to size groups. Find the correlation coefficient between size and defect in quality and its probable error. Size-group 15-16 16-17 17-18 18–19 19-20 20-21 No. of items : 200 270 340 360 400 300 No. of defective items : 150 162 170 180 180 114

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