Significance Test of Correlation Coefficient
			q When the true correlation coefficient is zero (H0: r=0 and H1: r¹0)       Use Student-t to test the significance of r                                  and  n = N-2 degree of freedom q When the true correlation coefficient is not expected to be zero       We can not use a symmetric normal distribution for the test.       We must use Fisher’s Z transformation to convert the distribution of r             to a normal distribution:
		mean of Z
					std of Z