correlation coefficient tends to lie between -
Ref:Parks 23rd edition pg 852 In order to find out whether there is significant association or not between the two variables , coefficient or Corelation is calculated . r lies between -1 and +1 r near -1 : indicates strong negative correlation . r = 0 : indicates no association r near +1: indicates strong positive correlation. Note: correlation does not necessarily prove causation .
Zero to - 1.0
0
+1.0 to zero
+2.0 to -2.0
Biostatistics