Question

Karl Pearson's correlation coefficient between x and y for the following data will be approximately

x :	28	40	41	35	38	33	40	36	32	33
y :	23	33	34	30	34	26	28	36	31	38

• A. 0.40
• B. – 0.40
• C. 0.44
• D. None of these

Answer 1

Answer: (C)

0.44

Answer 2

Use $r = \frac{\sum(x - \bar{x})(y - \bar{y})}{\sqrt{\sum(x - \bar{x})^{2}\sum(y - \bar{y})^{2}}}$.