The document discusses Z tests and the limitations of tests of significance. It describes how to perform a Z test to test the significance of a correlation coefficient in a small sample by transforming the coefficient into a Z value. It also explains how to use a Z test to test the significance of the difference between two sample correlation coefficients. Finally, it outlines some limitations of relying solely on significance testing, including that tests with small samples can lack power and tests with large samples can find even small effects to be significant.